Use swift 5.1 with the new SPM support in Xcode

1.0.0

Upgrade to swift 5

Add macOS Sierra support

Change the deployment target to macOS 10.12

ATEM Software 7.5.2

Add compatibility for ATEM Software Control version 7.5.2

💤 Graceful shutdown

• Fixes an issue that caused huge memory usage after a client disconnects.
• Add a readme with animated GIF

🕹 Touch Bar Transitions

Add a Touch Bar slider to control ATEM cross dissolves.

Simple switcher

Allows change of program and preview bus.