Add LICENSE file with GNU FDL 1.2

so the license is obvious for people checking out the code
add images with proper paths (from new wiki dump)
remove index and category pages

.. giti generates the categories and even as an "all pages" page
Update articles, add superfluous ones, add new ones
re-converted pages to markdown_github

hopefully gitit renders those better..
Getcvar_(script_event) should redirect to GetCVar_(script_event)
it should *really* redirect.
Add Metadata to pages
Replace stub an pybot lines
Fix Game-specific Notes and other details
Restore Src_idlib_math_cvectors.h page

.. the only of the Src_* pages with real content
what's wrong with the Coding links to D3_Networking articles?