Refactor BKE_blender into separate headers

- BKE_blender_version.h (only version defines & versionstr).
- BKE_blender_copybuffer.h (currently only used for view3d copy/paste).
- BKE_blender_undo.h (global undo functions).
- BKE_blendfile.h (high level blend file read/write API).

source/blender/windowmanager/intern/wm_init_exit.c

@@ -54,6 +54,7 @@
 #include "BLO_writefile.h"
 
 #include "BKE_blender.h"
+#include "BKE_blender_undo.h"
 #include "BKE_context.h"
 #include "BKE_screen.h"
 #include "BKE_DerivedMesh.h"
@@ -492,10 +493,10 @@ void WM_exit_ext(bContext *C, const bool do_python)
 	RE_FreeAllRender();
 	RE_engines_exit();
 	
-	ED_preview_free_dbase();  /* frees a Main dbase, before free_blender! */
+	ED_preview_free_dbase();  /* frees a Main dbase, before BKE_blender_free! */
 
 	if (C && wm)
-		wm_free_reports(C);  /* before free_blender! - since the ListBases get freed there */
+		wm_free_reports(C);  /* before BKE_blender_free! - since the ListBases get freed there */
 
 	BKE_sequencer_free_clipboard(); /* sequencer.c */
 	BKE_tracking_clipboard_free();
@@ -506,7 +507,7 @@ void WM_exit_ext(bContext *C, const bool do_python)
 	COM_deinitialize();
 #endif
 	
-	free_blender();  /* blender.c, does entire library and spacetypes */
+	BKE_blender_free();  /* blender.c, does entire library and spacetypes */
 //	free_matcopybuf();
 	ANIM_fcurves_copybuf_free();
 	ANIM_drivers_copybuf_free();
@@ -534,10 +535,10 @@ void WM_exit_ext(bContext *C, const bool do_python)
 	/* option not to close python so we can use 'atexit' */
 	if (do_python) {
 		/* XXX - old note */
-		/* before free_blender so py's gc happens while library still exists */
+		/* before BKE_blender_free so py's gc happens while library still exists */
 		/* needed at least for a rare sigsegv that can happen in pydrivers */
 
-		/* Update for blender 2.5, move after free_blender because blender now holds references to PyObject's
+		/* Update for blender 2.5, move after BKE_blender_free because blender now holds references to PyObject's
 		 * so decref'ing them after python ends causes bad problems every time
 		 * the pyDriver bug can be fixed if it happens again we can deal with it then */
 		BPY_python_end();
@@ -562,7 +563,7 @@ void WM_exit_ext(bContext *C, const bool do_python)
 	ED_file_exit(); /* for fsmenu */
 
 	UI_exit();
-	BKE_userdef_free();
+	BKE_blender_userdef_free();
 
 	RNA_exit(); /* should be after BPY_python_end so struct python slots are cleared */