wippatern_preview: Adding patern preview

This adds a preview of the patern placement, checking out of bound

includes/context.hpp

@@ -22,6 +22,7 @@ class SelectionMenu;
 class ControlMenu;
 class Selection;
 class PaternsMenu;
+class PaternPreview;
 
 typedef struct ctx {
   std::shared_ptr<World> world = nullptr;
@@ -32,6 +33,7 @@ typedef struct ctx {
   std::shared_ptr<ControlMenu> control_menu = nullptr;
   std::shared_ptr<Selection> selection = nullptr;
   std::shared_ptr<PaternsMenu> paterns_menu = nullptr;
+  std::shared_ptr<PaternPreview> patern_preview = nullptr;
   nlohmann::json config_json;
   std::filesystem::path program_dir;
 } ctx;