Fixes for tag edit

- Only update hilight on mouse click if mouse state is normal, was causing tagged list to be cleared during tag edit
- Refresh tagged list on ending tag edit
Added the SRB2 Lua language highlighter
support for more SRB2 stuff
Merge pull request #150 from STJrInuyasha/master

Support for SRB2 2.1 related lumps
Update VC++ 2005 project.
Update VC++ 2005 project
Fix missing semicolons in srb2lua.txt.
Merge branch 'master' of https://github.com/Gaerzi/SLADE into Music