PHLEGM v8 Revision r87 - GUI SKIN

GUI SKIN <STATUS|<MONO|ARGB>|<TREE|ICON>|<FLAT|ANIM>|<CHAR|FONT>>

Defaults: MONO / TREE / FLAT / FONT.
Color is presentation only; baked CHOP sources remain ARGB32.
MONO maps every nonzero-alpha CHOP sample to solid black and alpha-zero to
transparent. ARGB uses the original premultiplied ARGB32 samples, including
metallic/white surface shading and transparency.
TREE/ICON switches the existing shared navigation model.
FLAT always displays yaw frame zero; ANIM cycles prebaked CHOP frames.
CHAR uses the optional CHR GUI font; FONT restores native text.
The GUI Skin navigation section is the final top-level Tree/Icons node.
The command grammar and embedded .phlegm definitions are versioned to 23
so installed older definition sets are refreshed.

Build/graphics runtime test not performed in this environment: FreeBASIC
and native Windows/GTK execution environments are not installed.
