PLT-6215 Major post list refactor (#6501)

* Major post list refactor

* Fix post and thread deletion

* Fix preferences not selecting correctly

* Fix military time displaying

* Fix UP key for editing posts

* Fix ESLint error

* Various fixes and updates per feedback

* Fix for permalink view

* Revert to old scrolling method and various fixes

* Add floating timestamp, new message indicator, scroll arrows

* Update post loading for focus mode and add visibility limit

* Fix pinning posts and a react warning

* Add loading UI updates from Asaad

* Fix refreshing loop

* Temporarily bump post visibility limit

* Update infinite scrolling

* Remove infinite scrolling

webapp/yarn.lock

@@ -4884,7 +4884,7 @@ math-expression-evaluator@^1.2.14:
 
 mattermost-redux@mattermost/mattermost-redux#webapp-master:
   version "0.0.1"
-  resolved "https://codeload.github.com/mattermost/mattermost-redux/tar.gz/1ba6245017789943d286443b95fd75d651437df7"
+  resolved "https://codeload.github.com/mattermost/mattermost-redux/tar.gz/f19e3ea5487dcd172d177d271f1b596b23ef6ea5"
   dependencies:
     deep-equal "1.0.1"
     harmony-reflect "1.5.1"
@@ -6019,6 +6019,13 @@ rc@^1.1.2, rc@^1.1.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
+react-addons-perf@^15.4.2:
+  version "15.4.2"
+  resolved "https://registry.yarnpkg.com/react-addons-perf/-/react-addons-perf-15.4.2.tgz#110bdcf5c459c4f77cb85ed634bcd3397536383b"
+  dependencies:
+    fbjs "^0.8.4"
+    object-assign "^4.1.0"
+
 react-addons-pure-render-mixin@15.5.2:
   version "15.5.2"
   resolved "https://registry.yarnpkg.com/react-addons-pure-render-mixin/-/react-addons-pure-render-mixin-15.5.2.tgz#ebb846aeb2fd771336c232822923108f87d5bff2"