Mario Editor: add land type switching

mario/blocks.cpp

@@ -80,6 +80,13 @@ void MarioBlock::custom_move(int ticks) {
     }
 }
 
+void MarioBlock::setType(LandType::Value type) {
+    _type = type;
+}
+LandType::Value MarioBlock::getType() const {
+    return _type;
+}
+
 const std::vector< uint64_t > possibleBlocks = {
     FLOOR_ID,
     STEP_ID,
@@ -149,6 +156,13 @@ const std::vector< uint64_t > possibleCharacters = {
     MARIO_ID,
 };
 
+const std::vector< LandType::Value > possibleLands = {
+    LandType::OVERWORLD,
+    LandType::UNDERWORLD,
+    LandType::WATER,
+    LandType::BOWSER
+};
+
 const std::unordered_map< uint64_t, const SDL_Rect * > block_mapping = {
     { FLOOR_ID, &FLOOR_SRC },
     { HILL_INCLINE_ID, &HILL_INCLINE_SRC },