Fix MAGN-3092 where output port becomes too wide with long content

This pull request contains the following changes:

- Fixes defect [MAGN-3092](http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3092#) tracked internally
- Updated "BoolSelector" class to center its "WrapPanel" vertically
- Both input and output ports are now aligned in terms of their width (to the port with longest name)

Here is how it looks now:

![port-width-fixes](https://cloud.githubusercontent.com/assets/5086849/2688974/e275498a-c2db-11e3-9d19-9d9b8a3f0cf2.png)