Update compileSdk, targetSdk and built-tools/support

Update compileSdk, targetSdk and built-tools/support to 27 and 27.0.0 respectively; also updated circleci configuration

[CHORE] Bump app version to 1.0.18 - 35

[NEW] Spotlight now searchs the rooms that you are subscribed.

[NEW] Initial support for livechat channels & fix crash on 1.0.18

[IMPROVEMENT] Closes keyboard of the searchView (if opened) when a chat room is visible.

[IMPROVEMENT] Closes keyboard of a chat room (if opened) when sidebar is visible.

[IMPROVEMENT] Prevents keyboard hiding after typing a message.

User status on spotlight results (for DM rooms)