Previously we already switch to loading the bootstrap file only from the
local file (ec42553910).
This removes the remaining parts of loading the bootstrap file from a
remote location.
This also updates the UI in case of parsing errors of the bootstrap.json.
- create utilty function CGuiApplication::triggerShowHelp
- this function also uses "QWhatsThis::leaveWhatsThisMode" which solves the problem that the help was not properly called a 2nd time
- adjusted using classes