profile: remove [disable|enable]Shortcuts() signals

When switching to the "plan" or "add" (which should rather be
called "edit", by the way) mode of the profile, the "shortcuts"
for copy&paste, undo&redo, etc. are disabled. When switching
to "profile" mode, they are reenabled.

This was done in a most convoluted way:

- The MainWindow calls the set*State() function of the profile.
- The Profile emits [disable|enable]Shortcuts() signals.
- The MainWindow catches these signals and does the enabling
  or disabling.

Not only is this very hard to reason about, it is also in
contradiction to the profile being part of the display layer.

Moreover, in editCurrentDive() the MainWindow disabled the
shortcuts itself, so this was all redundant.

For the sake of sanity, let's just move this logic to the
MainWindow, unslotify the [disable|enable]Shortcuts() functions
and make them private.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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