Make keybinding conflicts more obvious in QuickTile console output

[ssokolow]

Given situations like issue #44, I should really amend the console output so that users can clearly see the presence or absence of messages like Received <Ctrl><Alt><KP_4>, resolved to preset [...]when trying to track down a problem.

"Opaque unless you know QuickTile's internals" is a bit of an understatement when talking about the current --debug messages.

I'll also want to pair it with a CONTRIBUTING.md that walks potential bug-reporters through checking things like that.