create primary-action-color classes and fix @mention tick color

packages/rocketchat-livechat/app/client/views/messages.html

packages/rocketchat-logger/client/views/viewLogs.html

packages/rocketchat-mentions/client.coffee

packages/rocketchat-theme/server/colors.less

packages/rocketchat-ui-message/message/message.coffee

packages/rocketchat-ui-sidenav/side-nav/sideNav.html

packages/rocketchat-ui/lib/RoomManager.coffee

packages/rocketchat-ui/views/app/room.coffee

packages/rocketchat-ui/views/app/room.html