add transform:get_size(), :set_size(...)

src/logic/scripting/lua/libentity.cpp

@@ -195,6 +195,8 @@ const luaL_Reg modeltreelib [] = {
 const luaL_Reg transformlib [] = {
     {"get_pos", lua::wrap<l_get_pos>},
     {"set_pos", lua::wrap<l_set_pos>},
+    {"get_size", lua::wrap<l_get_size>},
+    {"set_size", lua::wrap<l_set_size>},
     {"get_rot", lua::wrap<l_get_rot>},
     {"set_rot", lua::wrap<l_set_rot>},
     {NULL, NULL}