[[ RefactorSyntax ]] MCVarref methods updated to MCExecContext: resolve, evalvar, evalcontainer
[[ RefactorSyntax ]] Fixed a bug in MCChunk::getoptionalobj
[[ RefactorSyntax ]] MCChunk and MCVarref functions updated to return a bool
Merge branch 'refactor-syntax_unicode_shims' into refactor-syntax_unicode_shims1
[[ RefactorSyntax ]] Change few lines to directly use the return value of EvalExprAs