Config tweaks

Refactored QGCUASParamManager so that it is no longer a widget and contains no View code

Avoid re-requesting paramlist when opening new param widget; Fix widget promotion 

when param widget is loaded we only want to re-request the whole param list if we don't already have one

Set home

MVC decoupling of parameters-handling code

Fixed RC calibration trim problem

still some remaining issues with pending line items bouncing back from
data model

fix pending items indicator