Param filter

This fix makes the unit configuration easier to load and easier to operate with regards to filtering parameters.

Instead of immediate updates for every keystroke (in the input field) the parameter filtering is now controlled when the user hits enter with the input field focused, alternatively presses an added button next to the input field.

Additionally the parameters of the unit configuration page are defaulted to "display: none" and set to display only when the filtering happens. This makes loading the page much easier since normally all the parameters would be rendered and then the ones that have no setting hidden.