Show less entries in Omnibar by default

[PremadeS]

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Detailed description

In binaries which contain a large amount of flags, searching through the omnibar (the universal bar at the top) becomes a pain. Typing every character initiates a search through all, potentially thousands of flags.
This PR does the following:

• Shows 100 flag matches by default
• Gives two new entries at the bottom only if there are more matches than currently shown
  • Show More
  • Show All (also shows the current amount of results shown and total matches)
• Pressing "Show More" will show 100 more entries and "Show All" will show all of the found matches
• Ctrl + Return triggers "Show More"
• Ctrl + Shift + Return triggers "Show All"
• Return jumps to the address of flag, just as before
• When selecting "Show More" or "Show All" entries inside the completer, the original text (whatever was shown in the omnibar before selecting Show More/All) is preserved i.e: it doesn't autofill searchbar to "Show More"

Note that the number of visible entries resets back to 100 when the text is changed by the user (i.e: typing more characters or deleting)
Also the results are sorted by numeric mode, meaning sym.secret.100 will be shown after sym.secret.99

Test plan (required)

• Open Cutter with a large binary OR add a large amount of flags manually - maybe through rizin script
  • Refresh if you added flags manually View->Refresh Contents OR Ctrl + R
• Search for flag name in omnibar. Note that similar to before the search is "MatchContains" meaning if the flag name contains what's typed in the omnibar - it will count as a match and will be shown
• Observe it doesn't lag
• Scroll to the bottom of entries
• Try Show More and Show All
• Observe Show More and Show All don''t change the typed text and they are hidden if match count is not more than visible entries

I was also thinking it would be nice to provide users with the ability to change the default 100 entries count through preferences, user might also have the option to force Show All
it would require a new tab in preferences because more customizations for other widgets might be added in the future

Media
Comparison, searching through a list of 200,000 flags
Before:

After (lag on scrolling is just the gif):

Closing issues

closes #3581

[wargio]

maybe this should be configurable as if i use the screen in portrait mode, i may want to see more results.

[PremadeS]

Agreed, I mentioned that in the PR description

There should be a new tab for options similar to this, If I add it right now it would conflict with #3580 as the configurable options from QuickFilterView should be moved to this "new tab" as well.
I'll add the option as soon as #3580 is merged