Editor: Support multiple autotilesets per tile (#3082)

Tiles can now be present in multiple autotilesets in the same tileset. They would be autotileable with all (max. 10) autotilesets they are included in.

The editor allows for pressing keys 0-9 to choose from all 10 autotilesets the user can tile with. This is visually indicated in the autotile help strings.

Author: Vankata453

data/images/autotiles.satc

@@ -14,7 +14,7 @@
 ;;  |
 ;;  V
 ;; Contains :
-;;   The autotileset name (unused as of writing these lines) : (name "snow")
+;;   The autotileset name (used as an indicator in the editor) : (name "snow")
 ;;     The name of the autotileset is "snow".
 ;;   The default tile ID (used if no tile matches any mask) : (default 11)
 ;;     If a very special tile is needed (and it doesn't exist), it will use this tile (it's a center tile) by default.
@@ -75,7 +75,7 @@
 ;;       (Contributor, 2020)
 ;;
 ;;
-;; NOTE : A single id MUST NOT OCCUR MORE THAN ONE AUTOTILE IN THE ENTIRE FILE.
+;; NOTE : A single id MUST NOT OCCUR IN MORE THAN ONE AUTOTILE IN AN AUTOTILESET.
 ;;        Otherwise, the behavior is UNDEFINED.
 
 (supertux-autotiles

src/editor/editor.cpp

@@ -410,6 +410,12 @@ Editor::get_tileselect_move_mode() const
   return m_toolbox_widget->get_tileselect_move_mode();
 }
 
+void
+Editor::update_autotileset()
+{
+  m_overlay_widget->update_autotileset();
+}
+
 void
 Editor::scroll(const Vector& velocity)
 {

src/editor/editor.hpp

@@ -124,6 +124,8 @@ class Editor final : public Screen,
   void check_deprecated_tiles(bool focus = false);
   bool has_deprecated_tiles() const { return m_has_deprecated_tiles; }
 
+  void update_autotileset();
+
   /** Checks whether the level can be saved and does not contain
       obvious issues (currently: check if main sector and a spawn point
       named "main" is present) */