Re-added the string cache, disabled by default (bonus: also thread-safe)#172

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vintagedave wants to merge 11 commits intoRomanYankovsky:masterfrom

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Commits on Aug 4, 2015

Update README.md
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Commits on Apr 1, 2016

Merge branch 'master' of https://github.com/vintagedave/DelphiAST
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Commits on Apr 22, 2016

Re-adding string caching (memory optimization, for memory usage and also very importantly memory fragmentation).
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TValuedSyntaxNode uses the string cache
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Lexer uses the string cache for tokens
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TStringCacheDictionary is not used (was originally written for a dictionary of attributes, but attributes no longer work as a dictionary.)
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Basic threadsafety for the string cache. Not extensively reviewed. When threadsafe, any individual instance has get/add method contents wrapped in a lock, to lock the internal structures. The insta…
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Fixed typos for case where the ifdef to be threadsafe was turned off
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Comment; also holds lock for AddAndGet (enters lock individually for both operations; now holds it for both. Safe to enter a CS twice.)
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Revert "Update README.md"
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Commits on Apr 23, 2016

Information comment at the top of StringCache.pas
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