Improve inefficient screen space usage

[PremadeS]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've updated the documentation with the relevant information (if needed)
• I've used AI tools to generate fully or partially these code changes and I'm sure the changes are not copyrighted by somebody else.

Detailed description

• Removes the CutterTreeWidget that showed the item count in a status bar underneath the quick filter view

• Moves all duplicate logic from QuickFilterView and ComboQuickFilterView to AbstractFilterView which serves as a base class for both

• Adds the item count inside the line edit on the right side (see images below)

  • All quick filters can be hidden by default via Edit-Preferences->Interface->Show Quick Filter By Default
  • The item count label for all quick filters can be disabled via Edit->Preferences->Interface->Show Item Count in Quick Filter
  • The item count label by default takes up fixed space, meaning whatever space is left will be given to the text in the quick filter. If this is confusing try reaching the item count label by typing long text in the quick filter and/or resizing the widget that contains the quick filter
  • To save space the option Edit->Preferences->Interface->Hide Item Count on overflow can be set to checked, when checked the label will auto hide on overflow. Try reaching the item count label again by methods described above
  • Quick filter also shows two new options in context menu which contains individual options for showing and auto hiding the item count label. These options are temporary and will not be preserved when re-opening cutter. Only reason to add them is if a user wants to hide/show the label on just one quick filter. (note that all default line edit options will appear as normal but it will contain an "options" sub-menu underneath)

• Moving aside from quick filter, this PR also shrinks the height of header sections for QTableView, QTreeView and basically any other view that has header labels in all 4 cutter themes (see images below) .

The Border between widgets is too big.
In the 1366 screen, it is not very good thing IMO

This was mentioned in the original issue, not really sure if the user meant the header view sections or the title bar when referring to "border". Although the title bar seems reasonable in height, even when seeing on 1366x768 resolution

Also sets the shortcut context in search bar to be WidgetWithChildrenShortcut so it doesn't collide with same shortcuts in other widgets

Media
Item Count label
with Hide on overflow off:

with Hide on overflow on:

Header View sections
before (full image at the end):

after:

Comapred to IDA:

Compared to Ghidra:

Full images:
before:

after - notice the quick filter and header sections of string widget, (that contains Address, String... labels):

before (1368 x 768):

after (1368 x 768):

Test plan (required)

• Open cutter with any binary
• Observe the height of HeaderView sections
• Try searching in the quick filter view
  • Right click and show/hide the label
  • Right click and set/unset hide on overflow
  • try typing long texts, try resizing the parent widget
  • Go to Edit->Preferences->Appearance test all options in Quick Filter
  • Re-open cutter to make sure these options are preserved

Closing issues

closes #1923

[PremadeS]

I will check for any missed widgets one tests are green

[notxvilka]

@karliss what do you think about this change?

[notxvilka]

Tested on macOS ARM64 - works as intended