Fix targeted powers when clicking on actionbar; Change how touch input works

- 31b281d takes a more programmatic approach to some copy/pasted code
- f49e4c8 is a partial solution for #1168
- 76b5347 is an implementation of the idea discussed [here](https://github.com/clintbellanger/flare-engine/pull/1169#issuecomment-53847045). I don't think that press/hold behavior functions well for this type of game, nor is it easily discoverable. If others disagree with this method of handling touch input, I'll remove this commit from the pull request.