Scripting WIP (#70)

* Scripting introduced

* AppImage workflow fixes

* AppImage workflow simplified

* README.md update

* README.md update

* small fix

src/logic/scripting/scripting.h

@@ -0,0 +1,26 @@
+#include <string>
+#include <filesystem>
+
+namespace fs = std::filesystem;
+
+class EnginePaths;
+class Content;
+class Level;
+class Block;
+class Player;
+struct block_funcs_set;
+
+namespace scripting {
+    extern const Content* content;
+    extern Level* level;
+
+    void initialize(EnginePaths* paths);
+    void on_world_load(Level* level);
+    void on_world_quit();
+    void update_block(const Block* block, int x, int y, int z);
+    void random_update_block(const Block* block, int x, int y, int z);
+    void on_block_placed(Player* player, const Block* block, int x, int y, int z);
+    void on_block_broken(Player* player, const Block* block, int x, int y, int z);
+    void load_block_script(std::string prefix, fs::path file, block_funcs_set* funcsset);
+    void close();
+}