Add KeyActionFactory. Add compact length related methods to UhkBuffer. Add KeyActions.

config-serializer/serializeConfig.ts

@@ -9,9 +9,6 @@ let writer = new UhkBuffer();
 let uhkConfig = JSON.parse(fs.readFileSync('uhk-config.json'));
 let keyActions = uhkConfig.keymaps[0].layers[0].modules[0].keyActions;
 
-new SwitchLayerAction().fromJsObject({
-    keyActionType: 'switchLayer',
-    layerId: 10022
-});
+let keyActionObjects: KeyActions = new KeyActions().fromJsObject(keyActions);
 
 fs.writeFileSync('uhk-config.bin', writer.buffer);