qml main.go file decomposition

[bwiggs]

The qml/main.go was getting pretty large, so I moved all the different types to their own files and cleaned up the imports, var, and const declarations.

One side effect of this is that you can't just run go run main.go, because you have to list out each file individually. Instead use:

go build && ./qml
go run main.go frontend_view.go frontend_window.go qml_frontend.go keys.go qml_dialog.go

Happy to address any feedback.

[coveralls]

Coverage decreased (-0.16%) to 62.58% when pulling 6059eae on bawigga:main-decomposition into bb3e751 on limetext:master.

[bwiggs]

Also, I'm a bit of a golang newb. So if this isn't very gopher like I understand.

[quarnster]

LGTM, thanks!