Signed-off-by: Liam Cottam <killtheidols@hotmail.co.uk>

* Use Segoe UI for Latin characters before falling back to YaHei

This fixes issues with character rendering on hidpi displays and other
aliasing/hinting issues, as Segoe UI has been painstakingly hinted by
typographers for Microsoft while YaHei has not. See #3237 for more
details.

Closes #3237

* Include transformed LESS -> CSS in commit

* Viewport meta tag

* responsive: dashboard

* responsive: issues page

* responsive: Explore page

* responsive: navbar, and some navbar css refactoring

* responsive: button for collapsing navbar in mobile view

* Mark the hamburger button as active when pressed

* better homepage for responsive views

* Bring back jump class in navbar

The class was necessary, because this way the
dropdown doesn't assume the contents of the
selected item.

* make repository homes responsive

* Make file view page responsive

* Make forms look good on responsive views

* make commits and commit diff view responsive

* issues and PRs

* responsive wiki

* Don't place auto-init far off the page

* Minor changes to amend broken stuff

minor improvements

- make login/sign up in navbar stackable
- make navbar in explore and sign in not stackable

Change selected class in TestPullCompare

Fix typo that happened when rebasing

fix dashboard on org view

improve profile UI

Use clearing on file diff to fix broken UI caused by floating elements

remove unresolved merge conflict, and | Sanitize

Fix repo home not loading

* Add wrapping to long diff lines to fix #1827

* Fix  css class and make changes to source (less) files

* Fix wrong space indentation

* Fix indentation inconsistencies and remove very old WebKit workaround

* Create new branch from branch selection dropdown and rewrite it to VueJS

* Make updateLocalCopyToCommit as not exported

* Move branch name validation to model

* Fix possible race condition

* Add Activity page to repository

* Add request data for activity

* Add issue data for activity

* Add user unit right checks

* Add releases to activity

* Log repository unit loading error

* Fix and improve dashboard repo UI

* Change order of scripts loading

* Remove "mirror" tab

* Remove single tab panel for "org user"

* Add localization strings

* Create vue component and change event for search

* Add "mirrors" filter

* Scrollbars on overflow of horizontal nav

* Update _base.less

* Add fade out on right side of overflowing nav

* Update _base.less

- Update language choose dropdown to fit more languages

By adding a Japanese font in the less file, easier to see the display in
Japanese.

Collaborators have write access as default, and can be changed via repository
collaboration settings page to change between read, write and admin.

Implement Split Diff-View

- Unified/Inline Diff-View Selectable

This does not change any content and generated gogs.css is still the same.

Most commit in Git are expected to follow standard of single header line,
followed by description paragraphs, separated by empty line from previous block.

Previously Gogs were treating everything as single header. Now we are trying to
render only first line as header, but following lines (description chunks) as a
verbatim.

Otherwise the fix will be overwritten by next _octicons.less update.

This is follow-up for 22b0dfbb35.

This is because SHA1 label is used in many other places, not only inside
.repository container.

- copy link button: #1396, #1168, #1668,
- synxtax highlight: #1712, #1549, #1315, #670
- z-index: #1942