Start move to single column layout for advanced parameters; Fix
crashing bug in PrimaryFlightDisplay when uas is removed and then
re-added; workaround compiler warning in GeneralBlockPanelKernel,

Anton and I noticed that the message view stops autoscrolling properly
sometimes when there's a high frequency of arriving messages. This
should fix that problem.

Also fix a few compiler switch warnings

Add map type selector menu; use Bing maps by default; zoom to a more
human scale on Go Home

Changes for AdvParameterList number display, and proper handling of CH6/7/8 options in ArduCopter pids