* Reduced re-renders of Channel screen
* Switched some components to be PureComponents
* Stopped waiting for drawer to close to switch channels
* Fixed post list being stuck loading
* Fixed incorrectly removed ref
* Removed loader from channel post list
* Removed unused prop
* Re-added ChannelDrawer.swiperIndex
* Changed ChannelPostTextbox to only require a single draft
* Re-enable InteractionManager on ChannelDrawer
* Fixed ChannelDrawer.joinChannel and removed duplicated code
* Moved getting device dimensions into render method
* Switched ChannelsList to be a PureComponent
