Project filter

Added filters for gpacmp4, libpng & zlib to "clean" out the long list of
source files.
Merge pull request #3 from wforums/mp4

Mp4
First attempt
ttxt cont
Custom TTXT

Almost done, still left to do:
- update telxx.c to reflect changes
- add new commandline parameter + parsing.

608 & XDS are working already for normal & UCLA mode, nothing
broken/changed output wise.
Finished Custom TTXT

Finished.
- Reordered parameters
- Fully removed ccx_options.ucla_settings as it's fully replaced by the
transcript_settings
- Added parameter parsing + explanation for the custom TTXT
- Finished teletext changes for custom TTXT format
Small change

Forgot to update comment after switching around parameters.
Changes.txt updated
mp4 support
Merge branch 'pr/n57_wforums'

Conflicts:
	docs/CHANGES.TXT