add 'on_block_removed' event

src/logic/scripting/lua/libs/libcore.cpp

@@ -119,6 +119,7 @@ static int l_close_world(lua::State* L) {
     if (controller == nullptr) {
         throw std::runtime_error("no world open");
     }
+    controller->processBeforeQuit();
     bool save_world = lua::toboolean(L, 1);
     if (save_world) {
         controller->saveWorld();

src/logic/scripting/scripting.cpp

@@ -341,6 +341,13 @@ void scripting::on_world_save() {
     }
 }
 
+void scripting::process_before_quit() {
+    auto L = lua::get_main_state();
+    if (lua::getglobal(L, "__vc_process_before_quit")) {
+        lua::call_nothrow(L, 0, 0);
+    }
+}
+
 void scripting::on_world_quit() {
     auto L = lua::get_main_state();
     for (auto& pack : content_control->getAllContentPacks()) {
@@ -677,6 +684,8 @@ void scripting::load_content_script(
         register_event(env, "on_blocks_tick", prefix + ".blockstick");
     funcsset.onblockpresent =
         register_event(env, "on_block_present", prefix + ".blockpresent");
+    funcsset.onblockremoved =
+        register_event(env, "on_block_removed", prefix + ".blockremoved");
 }
 
 void scripting::load_content_script(

src/logic/scripting/scripting.hpp

@@ -81,6 +81,7 @@ namespace scripting {
     void on_world_load(LevelController* controller);
     void on_world_tick(int tps);
     void on_world_save();
+    void process_before_quit();
     void on_world_quit();
     void cleanup(const std::vector<std::string>& nonReset);
     void on_blocks_tick(const Block& block, int tps);