Persist geometry of ComponentDialog

[iwbnwif]

The ComponentDialog default size is generally too small to see all the rows and text.

This change 'remembers' the last size that the dialog was set to when the user pressed 'OK'.

It might be better to implement the settings write in the close event.

[iwbnwif]

I am thinking that it might be tidier to put the storing into onShow and onClose event handlers of a QucsDialog base class. Then any dialog that is resizeable can automatically inherit this functionality.

For 24.1.0 I would only propose to implement ComponentDialog from the new base class so we can be sure there are no issues.

[zergud]

it would be nice to implement settingsManager or at least use static QSettings settings("qucs","qucs_s") instead of hardcoded "organization" and "application" in many files
settingsManager is planned for #368 to store shortcuts for all actions

[iwbnwif]

Thanks, that makes a lot of sense.

I would suggest that all is needed is a static/singleton appSettings class that is a very thin wrapper around QSettings as I think QSettings has all the functionality needed?

The shortcut key implementation can follow on from the completion of the appSettings class.

[zergud]

all fuctionality +

• load defaults
• export/import setting
  at least for shorcuts

I think there is no need to rush and implement this in next release

@ra3xdh this PR can be merged now :)

[ra3xdh]

Thanks for contribution! Merged.