Start Wave v1.2.1

- added a short alias for the mutator: StartWave.Mut (StartWave.StartWaveMut is still available for use).

Start Wave v1.2.0

- fixed difficulty setting when changing wave;
- optimized boss replacement: now it always works successfully and quickly;
- players no longer need to download StartWave when connecting to a server.

Start Wave v1.1.0

- update build system.