Fixed Fl_Terminal xterm color 39/49 handling, and other mods.

Fixed a bug in the handling of xterm color 39 + 49, which avoids
applying Dim/Bold if default color is the special "see through" color
0xffffff00. A test will be added to test/terminal to excercise this
in a follow up commit.

Renamed CharStyle::?gcolor_uchar() -> CharStyle::?gcolor_xterm()
for a consistent naming convention.

Changed fltk_fg_color() from a static func to a CharStyle method
because it needs to access the defaultcolor for the special cases
for xterm colors 39 and 49.

Made CharStyle::attr_color() private, as per Jonathan Griffitts request
in issue #909.

Improved docs regarding effects of Dim/Bold for xterm and non-xterm color
methods.

Fl_Terminal::text?gcolor_xterm() methods now use CharStyle::?gcolor_xterm()
methods, removing the duplicate code logic.

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