Merge branch 'better-still-emoji' into shigusegubu

* better-still-emoji:
  change defaults
  bump limit to a saner one
  moved mentions into a separate component - MentionLine, added collapsing of mentions when there's too many of 'em
  fix empty spaces again
  configurable mentions placement
  moving mentions into separate row
  moved transparent button styles into button itself

src/modules/config.js

@@ -56,6 +56,8 @@ export const defaultState = {
   interfaceLanguage: browserLocale,
   hideScopeNotice: false,
   useStreamingApi: false,
+  mentionsOwnLine: false,
+  mentionsNewStyle: false,
   sidebarRight: undefined, // instance default
   scopeCopy: undefined, // instance default
   subjectLineBehavior: undefined, // instance default