Fix some encryption-related nil ptr dereferences
Add some missing MCValueRetains for kMCEmptyString
Fix "char 2 to 1 of field" chunk expressions, again
Replace some dodgy comparisons between StringRef and NULL
Ensure that stack security gets inited
MCAutoStringRefAsCString shouldn't free bogus pointers
Merge remote-tracking branch 'upstream/refactor-syntax_unicode' into refactor-syntax_unicode
Merge pull request #436 from runrevfraser/refactor-syntax_unicode

Refactor syntax unicode