feat: improve fx dialog

[DSCaskey]

This improves the functionality of the formula editor dialog. Also cleans up more of the code styling.

This cleans up the layout of the dialog. It replaces the radio buttons with a list widget to provide tabs more consistent with the Preferences and Pattern Piece dialogs.

Adds a formula reset toolbutton that will reset the formula to formula present when the dialog first opened.

Replaces the "pointing finger" icon with an "insert fx" icon:

It includes some added tooltips:

• Clear button tooltip
  

• Reset formula tooltip
  

• Insert tooltip
  

• Filter tooltip
  

• Function tooltips which now display a usage template for the selected function
  

This also changes the behavior when a Function is inserted. Inserting a function will now add the parentheses automatically, and will wrap them around any selected text in the formula box.

Closes issue #977

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[csett86]

This looks great, thanks a lot for the improvements, @DSCaskey

As it changes quite some strings, can you run lupdate as well please, so that the strings for translation are also up to date?

nmake lupdate

should do it under MSVC, or with mingw probably:

make lupdate

[DSCaskey]

As it changes quite some strings, can you run lupdate as well please, so that the strings for translation are also up to date

nmake lupdate

I know that... you can just run lupdate from within Creator. Ludate won't run at the moment... installing Qt6 messed up my kit settings., and I'm trying to sort them out.