- refactor glRenderer.h

- made transparent direct colors a compile-time opt-in since it appears to be non-standard

- got rid of the old numeric() function

- minor edit

- added close buttons to tabs

- removed obsolete stuff from colors.cc header

- disable the 'transparent' checkbox when there is no direct color selected

- changed all color usage to use LDColor classes instead of color indices. Added support for direct colors.

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