Add the ability to name input item actions

[WhiteMagic]

It should be possible to add a name or description to each input item, i.e. axis, button, hat, or key. This would make the profiles self documenting.

This description or name should be present both in the XML profile as well as the generated code, such that the code can do something with it if needed.

[WhiteMagic]

Implemented with commit 67ce76e