-Add settings file and load it from main script

-Change enable variable name so that it matches current naming convention
-Add Trailing Space commands to the command palette so that delete and toggle can be called even without shortcuts defined

Default.sublime-commands

@@ -0,0 +1,10 @@
+[
+	{
+		"caption": "Trailing Spaces: Toggle Trailing Spaces",
+		"command": "toggle_trailing_spaces"
+	},
+	{
+		"caption": "Trailing Spaces: Delete Trailing Spaces",
+		"command": "delete_trailing_spaces"
+	}
+]