Wrap lines in staging view

[stefanhaller]

• PR Description

Add a user config (on by default) to turn on line wrapping in the staging view (and custom patch building view).

Fixes #3558.

This is a bit of a longer PR because I had to fix a bunch of things to make this possible, and because it takes much more than just turning on Wrap on the staging view.

Usually when I make changes to gocui I include them in the lazygit PR for easier review; this time, however, the changes required touching gocui's tests, which are not included in our vendored copy, so I made a PR in gocui to be reviewed there, and only included the squashed changes here.

Hot-reloading of the new user config is not perfect: if the staging view is focused, you need to escape out of it and enter it again for the change to take affect. I wasn't sure it's worth adding code to fix this.

As for tests: I didn't find a way to add an integration test for this, as the view geometry is not fixed when you run them locally. But I didn't look into this very deeply.

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for b61c3951	✅ 92.90%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (b61c395)	Report Missing	Report Missing	Report Missing
Head commit (15288b7)	51421	44398	86.34%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4098)	155	144	92.90%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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Footnotes

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[jesseduffield]

LGTM. I'm cool with the caveats you mentioned