Fix bug in put before/after
[[ stonCache ]] Implements storing/fetching the number value from a stringRef during string_to_num conversions
[[ stonCache ]] Remove caching for octals conversion
Restore checks to prevent string being appended/prepended/etc to itself
[[ stonCache ]] STON cache now located after the last char
[[ stonCache ]] Ensure the numeric value is stored o at an 8-byte aligned position
Ensure native char is mapped to unicode codepoint in MCStringGetCodepointAtIndex
Fix filter command false negatives
Fix split command
Fix unicode last index of char
Fix findwordbreakbefore when given index is 0
Merge pull request #699 from runrevsebastien/refactor-syntax_unicode_ston

Refactor syntax unicode ston
Ensure strings never 'contain' empty