Add attachments for PR reviews (#16075)

* First step for multiple dropzones per page.

* Allow attachments on review comments.

* Lint.

* Fixed accidental initialize of the review textarea.

* Initialize SimpleMDE textarea.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/repo/issue/view_content/comments.tmpl

@@ -449,6 +449,9 @@
 								<span class="no-content">{{$.i18n.Tr "repo.issues.no_content"}}</span>
 							{{end}}
 						</div>
+						{{if .Attachments}}
+							{{template "repo/issue/view_content/attachments" Dict "ctx" $ "Attachments" .Attachments "Content" .RenderedContent}}
+						{{end}}
 					</div>
 				</div>
 			</div>