Add fpc_ProcID type and use it for all process IDs

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

src/d/d_s_play.cpp

@@ -1249,7 +1249,7 @@ int phase_1(dScnPly_ply_c* i_this) {
         delete l_lkDemoAnmCommand;
     }
 
-    uint id = fopScnM_GetID(i_this);
+    fpc_ProcID id = fopScnM_GetID(i_this);
     dStage_roomControl_c::setProcID(id);
 
     dComIfGp_setStartStage(dComIfGp_getNextStartStage());