The spacemouse driver, particularly on Mac, is extremely unstable and
causes crashes even when not being used. This places the interface
behind an advanced config flag to ensure that users can affirmatively
opt-in to the potential for crashes
Fix violations of 4.2.2 Function Definitions and 4.2.3 Control
Statements.
Set the minimum CMake version required to build to 3.1.
Removed the Visual Studio solution and project files.
Full support for using a 3Dconnexion device in the 3D viewer has been added. Full 3D navigation is available for both the orthographic and perspective projections. Commands are exported and can be assigned to 3D mouse buttons. Any limitations to the functionality are limitations of the installed 3Dconnexion driver for the device and OS.
ADDED: A build option KICAD_USE_3DCONNEXION (default = ON) has been added to the main CMakeLists.txt. The option controls whether the SpaceMouse support is compiled into the solution.
