filters: port colorize to awk

Python is not available on all systems. Port the colorize filter to awk
as it is a more widespread POSIX utility.

Users are free to copy the filter into their home dir and tweak the
colors to their needs. The highlighted items are:

  =============== ======= ======= ========= =================
  Item            Red     Green   Blue      Color
  =============== ======= ======= ========= =================
  quoted text 1   95      175     255       Blue
  quoted text 2   255     135     0         Orange
  quoted text 3   175     135     255       Purple
  quoted text 4   255     95      215       Pink
  quoted text *   128     128     128       Grey
  diff meta       255     255     255       White bold
  diff chunk      205     0       205       Cyan
  diff added      0       205     0         Red
  diff removed    205     0       0         Green
  signature       175     135     255       Purple
  header          175     135     255       Purple
  url             255     255     175       Yellow
  =============== ======= ======= ========= =================

This assumes a terminal emulator with true color support and with
a dark/black background.

Link: https://github.com/termstandard/colors
Signed-off-by: Robin Jarry <robin@jarry.cc>

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