Switch return type of _execute/_draw/_delete to be bool by default instead of BOOL

It's not completely consistent, but it seems like the majority used `bool`, and only a handful used `BOOL`. So I switched all of them to `bool` except for 13 TUs that stopped matching when changed like this.

src/d/actor/d_a_obj_otble.cpp

@@ -17,12 +17,12 @@ void daObj_Otble::Act_c::set_mtx() {
 }
 
 /* 00000168-000001BC       .text _execute__Q211daObj_Otble5Act_cFv */
-BOOL daObj_Otble::Act_c::_execute() {
+bool daObj_Otble::Act_c::_execute() {
     /* Nonmatching */
 }
 
 /* 000001BC-000002E8       .text _draw__Q211daObj_Otble5Act_cFv */
-BOOL daObj_Otble::Act_c::_draw() {
+bool daObj_Otble::Act_c::_draw() {
     /* Nonmatching */
 }