Create branch for adding heretic/hexen code.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1194
Add GPLed Heretic/Hexen source.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1195
Remove unused files.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1196
Reformat (beautify) Raven sources and add GPL headers.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1197
Fix #include statements to use lower case filenames. Add automake
configuration for building heretic/hexen code.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1198
Remove z_zone.c and tables.c, as these are identical to the version in
Doom.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1199
Add missing Hexen Makefile.am.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1200
Move doom-specific files to a separate directory.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1201
Add missing Makefile.am.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1202
Split event code into a separate d_event.c file.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1203
Remove includes of doomdef.h where possible, move generic parts into top
level.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1204
Remove dependencies of i_video.c on doom/ code.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1205
Split off patch code from r_defs.h into a common file. Remove dependency
of v_video.h on Doom rendering code.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1206
Add missing d_event.c.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1207
Move m_bbox.[ch], f_wipe.[ch] to doom/

Subversion-branch: /branches/raven-branch
Subversion-revision: 1209
Move dehacked code to doom/. Split dehacked string replacement code into
common code and remove dependencies on deh_main.h.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1210
Move m_bbox.[ch] back to common (needed by v_video.c). Remove some
common->doom header dependencies.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1211
Split off some of the s_sound.c code into i_sound.c and reimplement the
old low-level sound API as a thin wrapper around the module system.
Decouple the low-level code from the high-level code.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1212
Move s_sound.[ch] to doom/

Subversion-branch: /branches/raven-branch
Subversion-revision: 1213
Remove unneeded doomstat.h include.

Subversion-branch: /branches/raven-branch
Subversion-revision: 1214