Config: filtering standard and advanced parameters

This change adds a filtering box at the top of the "Standard Parameters" and "Advanced Parameters" views. User can type individual terms, separated by spaces in this box. As the user types, the parameters below are filtered to just display the ones that match all terms. This is a bit different than the searching in the "Full Parameter" view, but should still be helpful to narrow down the immense list of parameters.

This pull request is based against master, since I don't think there's anything Qt5-specific in this. I couldn't verify this however, so please test against Qt4.8 first...

(This should address/fix #135)