Expandable commit bodies (#2980)

* Initial working state of expandable commit bodies

* Fix all commits having showing button for multiline commits

* Refactor checking multiline messages method

* Force newlines with <br> in commit body

* Show multiple lines in the list view of repositories

* Fixed proper newlines and minor refactor

Use <pre> instead of <p>, this is so we can use \n instead of having to manually place <br> into the HTML. Makes it easier to display commit bodies.

* Fix commit list messages jumping around

* Fix indentation in view_list.tmpl

* Use vertical-align: baseline instead of top

* Refactor commit button toggle function

* Remove RenderCommitBodyLink function

* Add comments

* Add newline at the end of _repository.less

* Fix long commit bodies not properly wrapping inside <pre>

* Don't split on double newlines

* Show the commit body in commit view

* Update stylesheets

* Add/fix comments and run make fmt

* Fix spaces not being tabs

templates/repo/diff/page.tmpl

@@ -10,6 +10,9 @@
 					{{.i18n.Tr "repo.diff.browse_source"}}
 				</a>
 				<h3>{{RenderCommitMessage .Commit.Message $.RepoLink $.Repository.ComposeMetas}}{{template "repo/commit_status" .CommitStatus}}</h3>
+				{{if IsMultilineCommitMessage .Commit.Message}}
+					<pre class="commit-body">{{RenderCommitBody .Commit.Message $.RepoLink $.Repository.ComposeMetas}}</pre>
+				{{end}}
 			</div>
 			<div class="ui attached info segment {{if .Commit.Signature}} isSigned {{if .Verification.Verified }} isVerified {{end}}{{end}}">
 				{{if .Author}}