Updates to the IO Pi class

Added new methods for accessing whole IO bus directly, set_bus_direction(), set_bus_pullups(), write_bus(), read_bus(), invert_bus(), set_interrupt_on_bus(). Added get methods for each set method. Added unit tests for each IO Pi method Moved demos into demos folder Added optional parameter to IoPi to initialise the device. Changed all pin level methods to read the existing value from the MCP23017 before updating to allow for changes by other applications. Changed datatypes in all classes, unsigned char is now uint8_t, unsigned short is now uint16_t. Refactored code to reduce repetition.

Author: abelectronicsuk

CHANGELOG.md

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+#### 2020-07-01 Andrew Dorey
+
+* 1.1.0 Updates to the IO Pi class. 
+Added new methods for accessing whole IO bus directly, set_bus_direction(), set_bus_pullups(), write_bus(), read_bus(), invert_bus(), set_interrupt_on_bus(). 
+Added get methods for each set method. 
+Added unit tests for each IO Pi method
+Moved demos into demos folder
+Added optional parameter to IoPi to initialise the device. 
+Changed all pin level methods to read the existing value from the MCP23017 before updating to allow for changes by other applications.
+Changed datatypes in all classes, unsigned char is now uint8_t, unsigned short is now uint16_t.
+Refactored code to reduce repetition.
+
+
+#### 2020-04-22 Andrew Dorey
+* 1.0.9 Fixed memory leaks in the RTC SRAM functions for the Expander Pi and RTC Pi. Fixed out of bound errors in several demo files.
+
+#### 2020-04-21 Andrew Dorey
+* 1.0.8 Fixed various bugs in all C++ classes and updated all variables using char types to be unsigned char.
+
+#### 2020-02-27 Andrew Dorey
+* 1.0.7 Update README.md
+
+#### 2019-11-28 Andrew Dorey
+* 1.0.6 Added new I2C Switch library
+
+#### 2019-03-05 Andrew Dorey
+* 1.0.5 Fixed several bugs and optimised the code to improve performance.
+
+#### 2019-03-03 Gnurdle
+* 1.0.4 Scope wrap file handles to keep for leaking on exceptions
+
+#### 2018--07-16 Andrew Dorey
+* 1.0.3 Bug fixes in the write and read memory RTC functions in the RTC Pi and Expander Pi classes.
+
+#### 2018-04-24 Andrew Dorey
+* 1.0.2 Updated link for ADC Pi
+
+#### 2017-10-03 Andrew Dorey
+* 1.0.1 A new example file showing how to use the interrupt functions on the IO Pi.
+
+#### 2017-06-27 Brian Dorey
+* 1.0.0 Upload of initial code

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at sales@abelectronics.co.uk. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/