- Changed compilation for g_doom, g_heretic, g_hexen and g_strife folders

so that all files are included by a central one instead of compiling 
  each one separately. This speeds up the compilation process by 25%
  when doing a complete rebuild in Visual C.
- Cleaned up more header dependencies.

SVN r1226 (trunk)

src/g_hexen/a_hexenmisc.cpp

@@ -0,0 +1,53 @@
+#include "actor.h"
+#include "info.h"
+#include "p_local.h"
+#include "s_sound.h"
+#include "a_action.h"
+#include "m_random.h"
+#include "a_sharedglobal.h"
+#include "a_hexenglobal.h"
+#include "i_system.h"
+#include "thingdef/thingdef.h"
+#include "gi.h"
+#include "g_level.h"
+#include "p_enemy.h"
+#include "a_weaponpiece.h"
+#include "doomstat.h"
+#include "p_lnspec.h"
+#include "p_terrain.h"
+#include "m_bbox.h"
+#include "ravenshared.h"
+
+// Include all the Hexen stuff here to reduce compile time
+#include "a_bats.cpp"
+#include "a_bishop.cpp"
+#include "a_blastradius.cpp"
+#include "a_boostarmor.cpp"
+#include "a_centaur.cpp"
+#include "a_clericflame.cpp"
+#include "a_clericholy.cpp"
+#include "a_clericmace.cpp"
+#include "a_clericstaff.cpp"
+#include "a_dragon.cpp"
+#include "a_fighteraxe.cpp"
+#include "a_fighterhammer.cpp"
+#include "a_fighterplayer.cpp"
+#include "a_fighterquietus.cpp"
+#include "a_firedemon.cpp"
+#include "a_flechette.cpp"
+#include "a_fog.cpp"
+#include "a_healingradius.cpp"
+#include "a_heresiarch.cpp"
+#include "a_hexenspecialdecs.cpp"
+#include "a_iceguy.cpp"
+#include "a_korax.cpp"
+#include "a_magecone.cpp"
+#include "a_magelightning.cpp"
+#include "a_magestaff.cpp"
+#include "a_magewand.cpp"
+#include "a_pig.cpp"
+#include "a_serpent.cpp"
+#include "a_spike.cpp"
+#include "a_summon.cpp"
+#include "a_teleportother.cpp"
+#include "a_wraith.cpp"