Replace most uses of Map by HashMap

* Map is unnecessary and inefficient in almost every case.
* Replaced by the new HashMap.
* Renamed Map to RBMap and Set to RBSet for cases that still make sense
  (order matters) but use is discouraged.

There were very few cases where replacing by HashMap was undesired because
keeping the key order was intended.
I tried to keep those (as RBMap) as much as possible, but might have missed
some. Review appreciated!

1 files changed, 6 insertions, 3 deletions

diff --git a/scene/resources/canvas_item_material.h b/scene/resources/canvas_item_material.h
index b097d174f0..7c44c125a8 100644
--- a/scene/resources/canvas_item_material.h
+++ b/scene/resources/canvas_item_material.h
@@ -63,8 +63,11 @@ private:
 
 		uint32_t key = 0;
 
-		bool operator<(const MaterialKey &p_key) const {
-			return key < p_key.key;
+		static uint32_t hash(const MaterialKey &p_key) {
+			return hash_djb2_one_32(p_key.key);
+		}
+		bool operator==(const MaterialKey &p_key) const {
+			return key == p_key.key;
 		}
 	};
 
@@ -81,7 +84,7 @@ private:
 		int users = 0;
 	};
 
-	static Map<MaterialKey, ShaderData> shader_map;
+	static HashMap<MaterialKey, ShaderData, MaterialKey> shader_map;
 
 	MaterialKey current_key;