- client: fix closing mobile menu Fix AdguardTeam#1467

* commit '7e2ef010399c0a308131c14beca1f35eb9e331fd':
  - client: fix closing mobile menu

Merge: - client: fix loading of additional search results

Closes AdguardTeam#1275

* commit '86df748209cafc14379a0d43d321b4c4ed318dd5':
  - client: fix loading of additional search results

Merge: - DNS: configuration settings were not applied until full restart

* commit 'd65cdd4544efdecb9bbe36e411c0bbcb6475ba94':
  - DNS: configuration settings were not applied until full restart

Merge: + client: add X-DNS-Prefetch-Control meta tag

* commit '073643537612437430c7035cda679a758ca94d13':
  + client: add meta tag to index.html
  + client: add X-DNS-Prefetch-Control meta tag

Merge: - DNS: "custom_ip" blocking mode didn't work after app restart

Close AdguardTeam#1262

Squashed commit of the following:

commit bacd683
Author: Simon Zolin <[email protected]>
Date:   Mon Dec 16 17:00:49 2019 +0300

    fix

commit 3d4f962
Author: Simon Zolin <[email protected]>
Date:   Mon Dec 16 16:54:23 2019 +0300

    fix

commit bf924bf
Author: Simon Zolin <[email protected]>
Date:   Mon Dec 16 16:45:41 2019 +0300

    add test

commit 43338ea
Author: Simon Zolin <[email protected]>
Date:   Mon Dec 16 16:07:51 2019 +0300

    - DNS: "custom_ip" blocking mode didn't work after app restart

commit 220f32e
Author: Simon Zolin <[email protected]>
Date:   Mon Dec 16 15:46:01 2019 +0300

    - first run: fix panic on stop in case initialization didn't complete

    e.g. when Stats module can't be initialized because of incompatible file system