Add fpc_ProcID type and use it for all process IDs

See https://github.com/zeldaret/tp/pull/2173

src/d/actor/d_a_npc_de1.cpp

@@ -112,7 +112,7 @@ void daNpc_De1_c::setAttention() {
 }
 
 /* 00001194-000011C8       .text searchByID__11daNpc_De1_cFUi */
-void daNpc_De1_c::searchByID(uint) {
+void daNpc_De1_c::searchByID(fpc_ProcID) {
     /* Nonmatching */
 }