Colors
======

backend.setcolor(name, description)

  This will parse description, prepare attributes and save them under 'name'.
  Description is in format <foreground> "on" <background> "," <attributes>.
  For example:
    "black on cyan"
    "white on cyan" or "gray on cyan, standout" (equivalent)
    "yellow on red, underline, blink"

backend.pushcolor(name)

backend.popcolor()


Default theme
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menu-normal - black on cyan
menu-highlight - white on cyan

window-normal - gray on blue
window-highlight - white on blue
