New CMake versions warn when support for CMake 3.5 and before is
requested, so since we use a higher CMake minumum, just remove these
version checks in the thridparty code to remove the warnings.
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.
The commit only adds the headers and code required by the SpaceMouse
implementation to compile and link. This extract from the 3Dconnexion
SDK is added to the third party directory to allow developers to build without
needing to acquire a cmake enabled version.
Ian McInerney
Seth Hillbrand
markus-bonk