a little spring cleaning to remove some compiler warnings for

implicit declarations, redundant redeclarations, missing initializers,
nested externs and other cruft.

Cleaned up includes and moved extern _Type decls from Types.h into
Types.c since that is the only place where they are needed now.

Did not touch Ipo.[ch] since work is on-going there.

source/blender/python/api2_2x/Group.c

@@ -78,7 +78,7 @@ static PyObject *M_Group_getObjects( BPy_Group * self )
 }
 
 
-void add_to_group_wraper(Group *group, Object *ob) {
+static void add_to_group_wraper(Group *group, Object *ob) {
 	Base *base;
 	add_to_group(group, ob);