menuconfig: Add RGB color support to styles.

Styles can now take a HTML notation as a color value:
- on terminals that support RGB color mode these are rendered
  perfeclty
- on 256 color terminals the closes matching color is used
- on other terminals, the current color palette is scanned
  and the closes matching color is used. This has few quirks

Example: Use "pure" red as selection foreground and "pure" blue as
background:

MENUCONFIG_STYLE="selection=fg:#ff0000,bg:#0000ff"

Additionally, it is possible to copy the style from other elements,
for example:

MENUCONFIG_STYLE="selection=fg:#ff0000,bg:#0000ff path=selection"

In the notation above, the "path" style will be copied from "selection".

0 files changed, 0 insertions, 0 deletions