Improve usability on macOS when used as a KPart
This change removes some application attributes that are not necessary anymore (like disabling the global menu bar) or make Konsole behave slightly different when used from a KPart (e.g. inside Kate), and changes some keyboard shortcuts around (mainly using Command instead of Ctrl+Shift now.)
Unfortunately this does not resolve the requirement for the special keytab file for macOS; it looks like Qt does something funny with the QKeyEvents here: on Linux these have a text
attribute set to e.g. \u0003
for ^C
, that attribute is empty on macOS.