The IslePathActor's (#113)

* pizza: fix type m_unk90

* Initial implementation of a lot of IslePathActor's

All IslePathActor's seem to have (for the most part), the same few variables in common,
probably some ID. SkateBoard, Pizza and TowTrack seem to be a bit more complicated with additional
fields surrounding it.

* Add missing ClassName(s) and IsA(s)

* Add decomp size asserts

* Fix size assertions

* Make legopathactor fields protected for now, fix a type in Pizza

* Fix TowTrack structure

---------

Co-authored-by: Christian Semmler <mail@csemmler.com>

LEGO1/bike.h

@@ -1,6 +1,7 @@
 #ifndef BIKE_H
 #define BIKE_H
 
+#include "decomp.h"
 #include "islepathactor.h"
 
 // VTABLE 0x100d9808
@@ -22,7 +23,9 @@ public:
   {
     return !strcmp(name, Bike::ClassName()) || IslePathActor::IsA(name);
   }
-
+private:
+  // TODO: Bike fields
+  undefined m_unk160[4];
 };