[WIP] Fully-functional Slices#166

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Miha-x64 wants to merge 4 commits intojson-iterator:masterfrom

Miha-x64:slice-enhancements

Commits on Mar 4, 2018

now readSlice will read either a DirectSlice, if there were no escape or multibyte chars, or will allocate a String and return a StringSlice
Miha-x64
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fixed len() -> size() function in codegen
Miha-x64
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Commits on Mar 5, 2018

probable fix of toString() -> string() function in codegen
Miha-x64
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Commits on Mar 6, 2018

Range check
Miha-x64
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