Replace fomantic popup module with tippy.js (#20428)

- replace fomantic popup module with tippy.js
- fix chaining and add comment
- add 100ms delay to tooltips
- stopwatch improvments, raise default maxWidth
- update web_src/js/features/common-global.js
- use type=submit instead of js

templates/repo/issue/view_content/add_reaction.tmpl

@@ -7,7 +7,7 @@
 		<div class="header">{{ .ctx.locale.Tr "repo.pick_reaction"}}</div>
 		<div class="divider"></div>
 		{{range $value := AllowedReactions}}
-			<div class="item reaction" data-content="{{$value}}">{{ReactionToEmoji $value}}</div>
+			<div class="item reaction tooltip" data-content="{{$value}}">{{ReactionToEmoji $value}}</div>
 		{{end}}
 	</div>
 </div>