Blender Git Loki

TextEditor: syntax color support.

Patch provided by Ricki Myers. Works quite obvious, see Theme editor too!

Notes about the provided code;
- The default syntax colors were screaming! Toned it down to match the
default dark on lightgrey background better.
- Added: initializing colors in saved themes (usiblender.c)
- The implementation of the button for this option was quite clumsy...
Blender UI options services this a lot easier.
(Same fixed for 'line numbers' option)
- Bracket matching now uses as color a mix of backdrop and the
selected-text color. Noticed my texteditor did it too...

-> I really miss comments in code describing a little bit the thought
process behind the code. Like a short introduction on this feature
in the top of the drawtext.c, little remarks on new functions.
ALso in patch tracker or the mailinglist no docs was mentioned?

-> drawtext.c now gets messy quickly... lack of overview, structure,
and confusing mix of personal coding styles.
For not-active supported code dangerous...