p4: make tag editor and track organizer optional

[gbcox]

p4: make tag editor and track organizer optional

this patch adds build-time toggles for the tag editor and track organizer:

-DENABLE_TAGEDITOR_SUPPORT=OFF
-DENABLE_TRACKORGANIZER_SUPPORT=OFF

these features have been the source of bug reports and are not essential for core playback or library functionality. making them optional improves build flexibility and allows distros to exclude them if desired.

• does not affect tag reading, only tag modification if OFF
• patch is scoped to build flags only—no functional changes unless disabled
• defaults remain unchanged unless explicitly toggled
• builds cleanly with both features disabled