add or fix input tips when create a channel

Adds infinite scrolling to channels list

Conflicts:
	packages/rocketchat-ui-sidenav/side-nav/listChannelsFlex.coffee
	server/methods/channelsList.coffee

Added search bar to the channels flex

Hotfix/query improvements

Prevent non array attachments

the input add members tips ( auto-complete --"placeholder") should be replaced by some strings when create a private group

the input add members tips ( auto-complete --"placeholder") should be replaced by some strings when create a new channel (or private group)

Admin View Logs should auto-scroll to end

Created and pushed by LingoHub.