IK updated MixBox CS with sidechain support in the British Dynamics 500 series compression module.

What's new in MixBox CS v1.1.1:
What’s New in v1.1.1
- Added sidechain functionality to British Dynamics module
- Added Messages center in Global Menu for new preset alerts and updates
- Fixed a potential crash with accessing menu windows during app startup
- Fixed a bug that prevented sidechain compression on standalone app
- Fixed an issue with I/O setup resetting the UI values upon restart