Implemented lua, shaking out latent bugs

libmap/region_pager_api.cpp

@@ -104,6 +104,8 @@ static int unloadRegion(lua_State* L) {
 	return 0;
 }
 
+//TODO: check that parameters are not null
+
 static int setOnLoad(lua_State* L) {
 	RegionPagerLua* pager = reinterpret_cast<RegionPagerLua*>(lua_touserdata(L, 1));
 	luaL_unref(L, LUA_REGISTRYINDEX, pager->GetLoadReference());

libmap/region_pager_base.cpp

@@ -28,6 +28,8 @@ RegionPagerBase::~RegionPagerBase() {
 	UnloadAll();
 };
 
+//TODO: add nullptr checks to the calls to GetRegion()
+
 Region::type_t RegionPagerBase::SetTile(int x, int y, int z, Region::type_t v) {
 	Region* ptr = GetRegion(x, y);
 	return ptr->SetTile(x - ptr->GetX(), y - ptr->GetY(), z, v);

libmap/region_pager_lua.hpp

@@ -28,6 +28,8 @@
 #include <functional>
 #include <string>
 
+//NOTE: set the lua hook before use
+
 class RegionPagerLua : public RegionPagerBase {
 public:
 	RegionPagerLua() = default;