Remove per-player sensors, solves issue #40

[Afforess]

The major change here is that get_line now includes the player. [Fixes #40. -Narc]

Note: This PR also includes changes from PR #47, do not accept this until PR #47 is accepted.

[narc0tiq]

Excellent! This is exactly what I wanted from #40, thanks very much!

However, for future reference, it is preferable to build separate disconnected PRs than do... whatever it is that just created different commit IDs for the same commits. Some rebasing may have been involved? Not to fret, though, I can fix this.

[Afforess]

@narc0tiq I can try and rebase myself.

Edit: Ninja'd.

[narc0tiq]

Merged in b09ca68.

I think in your case, it'd be some cherry-picks to rewrite history so that only the commits that actually need to be in each PR will be in it, followed by a force-push to the PR branches.