Fix various compile errors

[simeks]

I found a few more compile errors so I made some minor fixes.

For the Window methods I guess it might make more sense to just keep the alias as-is and change the names in the module itself instead (setWindowPosCallback instead of setPosCallback), but I'll leave that for you to decide.

As for breaking things:

• I changed Monitor.getPos to work just as Window.getPos. Return c_int as provided by the GLFW API, and return an array instead of a slice.
• focuswindow -> focusWindow, assuming this was a typo.

[hazeycode]

Thanks!

For top-level fn names I think we should prefer sticking to how they are named in glfw rather than changing them. As this offers the least surprises for users of that API. For our "scoped aliases" however, we can deviate from underlying api naming somewhat.

[simeks]

Thanks for the quick response! That makes sense, so now I've changed the top-level function names instead.

[hazeycode]

Thanks!