Support XYplorer Commands

Adds support to send XYplorer scripting commands to XYplorer. Still in
testing phase.
Admin Elevation Support. Icons Support.

Changed XYplorer commands to "xys::". Admin elevation required programs
can use "admin::" so no need for "cmd.exe /c". Both commands will have
proper icon support. Improve comment clarity in code. Small tweaks and
GUI modifications. Some other stuff.
Small changes.

Small simple changes.
Added XYplorer and Admin Commands to Special Items

Now when adding new favorite items, the Special Items menu contains
shortcuts for XYplorer's Scripting and Admin. Also, some small fixes and
other changes. "XYS_F::" is now added which will force focus of
XYplorer's main window. "XYS::" will keep the XYplorer's window in
whatever state it currently is while running the script.
No code changes. Updated AutoIt.

Updated AutoIt to 3.3.12.0. AutoIt compiler resides together with code
for easily compilation.