Merge pull request RobTillaart#159 from RobTillaart/develop

0.2.2 major updates XMLWriter

Author: RobTillaart

libraries/XMLWriter/LICENSE

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+MIT License
+
+Copyright (c) 2013-2020 Rob Tillaart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

libraries/XMLWriter/README.md

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+# XMLWriter
+
+Arduino Library to create simple XML (messages, files, print, ...)
+
+## Description
+
+The XMLWriter class supports generating XML files and send these over a stream
+like Ethernet SD.File or Serial.
+
+When instantiating an XMLWriter one can define the internal buffer size.
+This buffering makes the output faster, especially for Ethernet and SD.File.
+The buffer size should be at least 2 bytes.
+A bigger buffer is often faster but it also depends on the properties of the
+stream to see real performance gains.
+E.g. the baudrate and internal buffer of Serial, packet behaviour of Ethernet,
+or paging of SD cards.
+So if performance is an issue one should do some testruns with different sizes
+for the buffer and choose one that is appropriate.
+
+Indicative sizes based upon the examples.
+Run your tests to find your application optimum.
+
+| STREAM | SIZE |
+|:------------|:----------|
+| Ethernet | 20-30 |
+| Serial | 5 |
+| SD File | 10-16 |
+
+Important to know when usinig buffering is that your code should always include
+a call to **XML.flush()** at the end of the XML generation to flush the buffer.
+
+## Operation
+
+See examples
+