Packages with krb lib fix

See merge request !283

EE Packages for 7.6.3

See merge request !282

Custom header logo

# What does this MR do?

Adds enterprise feature that enables administrator to customize the small header logos in the header/navigation bar. There are 2 custom logos that must be uploaded - one for light themes and one for dark themes.

Both a `dark` and `light` logo must be uploaded for the custom header logo. There are validations to prevent only one. Otherwise if a user chooses a light logo they might have a custom logo but another user with a dark theme would see the standard GitLab logo.

# Are there points in the code the reviewer needs to double check?

Look at the `appearances_helper.rb`, specifically the `brand_header_logos` method. I tried to keep all of the logic inside the appearances helper to avoid future merge conflicts in the view. Is there a better way to do this other than inline styles?

See code comment in `appearances_helper.rb` for another question.

# Why was this MR needed?

Enterprise users like the ability to brand GitLab to their organization. The appearances support was a great first step. This builds upon that by allowing users to upload logos for the header.

# Screenshots

Appearances admin page showing what the page looks like after custom logos have been uploaded. I added the basic and dark backgrounds to the respective logos so they appeared closer to how they will in the header.

![appearances_admin](https://gitlab.com/uploads/subscribers/gitlab-ee/c7e0338be2/appearances_admin.png)

With a dark theme selected.

![dark_logo](https://gitlab.com/uploads/subscribers/gitlab-ee/31faaf70f6/dark_logo.png)

With a light theme selected.

![light_logo](https://gitlab.com/uploads/subscribers/gitlab-ee/46b4942df8/light_logo.png)

See merge request !26

Drop old fields

Fixes #143

See merge request !281

Performance fixes

Fixes #195

See merge request !280

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Ajax group select

Helper method for creatins select2 selectbox with ajax query to groups via API

See merge request !279

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

CE changes from master

Sidebar navigation, OAuth and other changes from CE

See merge request !275

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	Gemfile
	app/controllers/application_controller.rb
	app/views/admin/groups/_form.html.haml
	app/views/groups/edit.html.haml
	app/views/groups/show.html.haml
	app/views/layouts/nav/_admin.html.haml
	app/views/projects/_settings_nav.html.haml
	db/schema.rb
	doc/install/installation.md
	doc/update/6.x-or-7.x-to-7.6.md

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Oauth2 provider

Please update #1713

See merge request !1346

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Conflicts:
	app/views/layouts/nav/_profile.html.haml

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

* improve UI
* add authorization
* add separate page for oauth applications
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

UI improvements

Set of UI changes mostly for issue and merge request

* return edit/close buttons to old position (right of title)
* make 'Issue #1' header smaller
* move mr commits to separate tab
* change inline/side diff switcher to buttons from tabs
* make issue sidebar start with dicsussion block

See merge request !1351

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

* return edit/close buttons to old position (right of title)
* make 'Issue #1' header smaller
* move mr commits to separate tab
* change inline/side diff switcher to buttons from tabs
* make issue sidebar start with dicsussion block
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>