New version, new name (Open Unreal SpaceMouse 2.0)

[microdee]

I'm currently re-writing this plugin as I need this to work good now in a personal project, and I wanted to improve the code quality a lot to my currently held standards. This means couple of long standing jank is already fixed and more will come in the future.

See the PR #110

Still, devices are directly read from HID, no need to install 3DxWare, and Open Unreal SpaceMouse will remain free even on the marketplace (that will still need a lot of extra work).

Some planned features before I publish pre-built binaries:

• Devices can be connected/disconnected while Unreal is running
• All buttons working on SpaceMouse Enterprise
• Orbit translation speed depends on object distance
• Free-fly rotation speed depends on Viewport FOV
• Viewport UI for SpaceMouse device status
• Long requested feature for "Object placement mode"
  • This will need customizable viewport behaviour architecture

The minimum engine version supported will be 5.2 (maybe 5.1, we'll see).