Move admin/addons to src/Module

- Add Module\Admin\Addons\Index class
- Add route for admin/addons
- Add addons admin aside menu entry
- Remove unused template admin/addons.tpl from base and frio
- Remove addon list from mod/admin

view/theme/frio/templates/admin/addons.tpl

@@ -1,22 +0,0 @@
-
-<div id='adminpage'>
-	<h1>{{$title}} - {{$page}}</h1>
-		{{if $pcount eq 0}}
-		    <div class="error-message">
-		    {{$noplugshint}}
-		    </div>
-		{{else}}
-		<a class="btn" href="{{$baseurl}}/admin/{{$function}}?a=r&amp;t={{$form_security_token}}">{{$reload}}</a>
-		<ul id='addonslist'>
-		{{foreach $addons as $p}}
-			<li class="addon {{$p.1}}">
-				<span class="offset-anchor" id="{{$p.0}}"></span>
-				<a class='toggleaddon' href='{{$baseurl}}/admin/{{$function}}/{{$p.0}}?a=t&amp;t={{$form_security_token}}#{{$p.0}}' title="{{if $p.1==on}}Disable{{else}}Enable{{/if}}" ><span class='icon {{$p.1}}'></span></a>
-				<a href='{{$baseurl}}/admin/{{$function}}/{{$p.0}}'><span class='name'>{{$p.2.name}}</span></a> - <span class="version">{{$p.2.version}}</span>
-				{{if $p.2.experimental}} {{$experimental}} {{/if}}{{if $p.2.unsupported}} {{$unsupported}} {{/if}}
-				<div class='desc'>{{$p.2.description nofilter}}</div>
-			</li>
-		{{/foreach}}
-		</ul>
-		{{/if}}
-</div>