Additional input options

[flaviozavan]

Adds the possibility to configure disabling the input device while typing and
allows for choosing the click method. Both of which are useful for touchpads

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Two points to consider:

1. I wasn't sure if the way I set the default values is within expectations or not;
2. I couldn't figure out how to run the tests.

[inclement]

Thanks very much, looks great except some minor tweaks.

The tests needed manually starting as that seems to be the default for a first PR from someone, but I think they should now run automatically on future commits.

[inclement]

I wasn't sure if the way I set the default values is within expectations or not;

I think ideally these should be pulled out to some centralised defaults list, but I hadn't thought about it before (and it didn't come up with the other libinput values) so there isn't an obvious one right now. Happy to merge as-is and change it later, I've made #92 to think about it.

That said, I think there's a case for making both options disabled by default - dwt in particular can be annoying for some (although essential for others, it's just subjective and hardware-dependent). Still happy to merge as-is, but I might push to change the defaults later.

[flaviozavan]

Addressed the comments. About the defaults. I don't really care about the ones I chose, they were simply my touchpad's default and I wanted to change them. I made it default to none/disabled now. The centralized defaults idea seems like a pretty good idea.

I figured out how to run the tests locally this time. So they should pass now.

[inclement]

Great, thanks again.