macOS: rename blender.app to Blender.app

Using a capitalized app name fits the platform guidelines. Since macOS file
systems are case insensitive by default this should not break scripts that
assume lowercase.

GNUmakefile

@@ -228,7 +228,7 @@ endif
 # Allow passing in own BLENDER_BIN so developers who don't
 # use the default build path can still use utility helpers.
 ifeq ($(OS), Darwin)
-	BLENDER_BIN?="$(BUILD_DIR)/bin/blender.app/Contents/MacOS/blender"
+	BLENDER_BIN?="$(BUILD_DIR)/bin/Blender.app/Contents/MacOS/Blender"
 else
 	BLENDER_BIN?="$(BUILD_DIR)/bin/blender"
 endif