A preliminary skeleton for threaded unitsync.
Proof of concept implementatino of async unitsync.
Make wrapper generator fail on parse errors.
Generate the complete UnitsyncHandlerAsync.
Generate UnitsyncWrapper.js
Fix jsReadFileVFS().
Don't crash when unitsync returns NULL.
Fix jsReadFileVFS() (accidentally reverted).
Don't use wide strings, they break unicode.
Merge branch 'threaded_unitsync'