v0.21 release

Added null check to WS_ReleaseObject()

Fixed error handling in WS_Init()

Added some additional remarks.

Added remark warning about % in string blocks.

Added MIT License and copyright

Removed codef(), WS_ErrMsg(), and ScriptStr() functions, and as such the __iScriptControlObj__ variable.
Renamed the 2 internal vars to be a little more obscure.

Updated documentation

index.html:
Removed older example links.
Updated change log.
Added stuff about the memory leak

ws4ahk.ahk:
Fixed some docs
Lots more doc updates.
Improved WS_ReleaseObject()
Fixed error message for ansi->unicode conversion.

test_suite.ahk: Updated function names.

COMmemLeak.ahk:
Reproduce memory leak

test_suite.ahk:
Updated function names.
lots of messy tests