- rewrote p_local.h so that it doesn't pull in the entire bunch of headers.

This was to resolve some circular dependencies with the portal code.
The most notable changees:

 * FTextureID was moved from textures.h to doomtype.h because it is frequently needed in files that don't want to do anything with actual textures.
 * split off the parts from p_maputl into a separate header.
 * consolidated all blockmap related data into p_blockmap.h
 * split off the polyobject parts into po_man.h

src/g_shared/a_randomspawner.cpp

@@ -16,6 +16,8 @@
 #include "a_action.h"
 #include "thingdef/thingdef.h"
 #include "v_text.h"
+#include "doomstat.h"
+#include "doomdata.h"
 
 #define MAX_RANDOMSPAWNERS_RECURSION 32 // Should be largely more than enough, honestly.
 static FRandom pr_randomspawn("RandomSpawn");