OAuth2 Grant UI

[jonasfranz]

This PR adds the ability of revoking access for certain application via the settings UI.

Screenshots:

[codecov-io]

Codecov Report

Merging #6625 into master will increase coverage by <.01%.
The diff coverage is 54%.

@@            Coverage Diff             @@
##           master    #6625      +/-   ##
==========================================
+ Coverage   40.75%   40.76%   +<.01%     
==========================================
  Files         407      407              
  Lines       54680    54730      +50     
==========================================
+ Hits        22284    22308      +24     
- Misses      29344    29368      +24     
- Partials     3052     3054       +2

Impacted Files	Coverage Δ
routers/user/setting/oauth2.go	0% <0%> (ø)	⬆️
routers/routes/routes.go	81.99% <100%> (+0.02%)	⬆️
routers/user/setting/applications.go	45.61% <20%> (-2.47%)	⬇️
models/oauth2_application.go	58.78% <80.64%> (+2.73%)	⬆️
models/unit.go	0% <0%> (-14.29%)	⬇️
routers/repo/view.go	41.08% <0%> (-1%)	⬇️
modules/log/event.go	65.98% <0%> (+1.52%)	⬆️

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[lunny]

@jonasfranz I mean ctx.QueryInt64("id") maybe zero, but not ctx.User.ID. If ctx.QueryInt64("id") is zero will delete all grants.

[jonasfranz]

@lunny fixed