Add "bulk mute/unmute/block/unblock" feature

As another part of #227 (closed), this will add a bulk feature to mutes/blocks tabs.

Technical notes;

• Replaced withList HOC with List component since component composition using slots is more flexible than HOC for the list purpose and also it is the preferred way of Vue.
• Added reusable Checkbox, ProgressButton and SelectableList components.
• Moved line style for splitting list items from BasicUserCard to List component.

Screenshots

• None-selected state

• All-selected state

• Indeterminate state

src/components/basic_user_card/basic_user_card.vue

@@ -24,19 +24,11 @@
 <script src="./basic_user_card.js"></script>
 
 <style lang="scss">
-@import '../../_variables.scss';
-
 .basic-user-card {
   display: flex;
   flex: 1 0;
   margin: 0;
-  padding-top: 0.6em;
-  padding-right: 1em;
-  padding-bottom: 0.6em;
-  padding-left: 1em;
-  border-bottom: 1px solid;
-  border-bottom-color: $fallback--border;
-  border-bottom-color: var(--border, $fallback--border);
+  padding: 0.6em 1em;
 
   &-collapsed-content {
     margin-left: 0.7em;