Toolbar: fix Scintilla HWND retrieval bug
Upgrade to SciTE/Scintilla 3.5.0 + AHKv2 Lexer Changes:

- Object command syntax now supported.
- Added styles for object properties/methods (and built-in ones).
- Fixed "escape sequence followed by deref" bug.
Bump to v3.0.06
AHK v1.1/v2: add AutoComplete/CallTips for built-in object methods
Debugger: make 'current line' marker translucid [requested by Lexikos]
Debugger: minor cleanup + use new mechanism for [Debugging] marker
Setup: update obsolete AutoHotkey version warning screen
Properties: placeholder directives for future single-exe S4AHK build