Expose asm.reloff.flags in Preferences

[Surendrajat]

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Detailed description
This PR adds asm.reloff.flags checkbox under Preferences -> Disassembly.

Test plan (required)
Go to Preferences -> Disassembly -> check Show offsets relative to a flag (asm.reloff.flags)

Closing issues

[karliss]

I am slightly worried about cluttering the first page with too many rarely used settings. @ITAYC0HEN what do you think?

[ITAYC0HEN]

For this specific case it can use different ui components, for example

Show offset as relative to:    [x] Functions [ ] Flags
Show offset as relative to:    [ ] Functions [x] Flags
Show offset as relative to:    [x] Functions [x] Flags
Show offset as relative to:    [ ] Functions [ ] Flags

Or a combo box maybe (like I did with comments).

In general, I was thinking about it as well, and I see couple of ways we can go. Of course, some of them can be combined.

1. First of all, the most complicated one, is refactoring of the whole thing into a modern setting widget (e.g vscode's). I think that Binja has something similar as well. This includes full descriptions, automatically creating the view etc. And of course with a quick filtering and a way to work together with a command pallette in the future.

2. Turn the dialog into a dockable widget. This will allow more space and the items will look less crowded

3. Use group boxes to gather related configurations together in a logical way. This will make it visually easier to navigate in the view.

4. Use more tabs, and group configurations together in a logical way

5. Use sub-items in the side bar to organize configurations in a logical way

6. Use collapsible part at the bottom of the view to hide less-common config

[Surendrajat]

@ITAYC0HEN For this change I like the first idea you suggested. It'll save up space and will be consistent with the current logic of graph.offset which won't really fit in the comboBox.
About the entire preference view change, yes, I like that idea too but I am not quite ready to pick it yet. If base is set, I can add things to it :)

[Surendrajat]

This is how it looks like now:

[ITAYC0HEN]

I think that "Show offsets relative to" can also be grayed out when asm.offset is disabled :)

[Surendrajat]

@ITAYC0HEN Cool. It's done now. I've rebased and the build is broken but it should work.

[ITAYC0HEN]

Looks good now :)