PLT-3105 Files table migration (#4068)

* Implemented initial changes for files table

* Removed *_benchmark_test.go files

* Re-implemented GetPublicFile and added support for old path

* Localization for files table

* Moved file system code into utils package

* Finished server-side changes and added initial upgrade script

* Added getPostFiles api

* Re-add Extension and HasPreviewImage fields to FileInfo

* Removed unused translation

* Fixed merge conflicts left over after permissions changes

* Forced FileInfo.extension to be lower case

* Changed FileUploadResponse to contain the FileInfos instead of FileIds

* Fixed permissions on getFile* calls

* Fixed notifications for file uploads

* Added initial version of client code for files changes

* Permanently added FileIds field to Post object and removed Post.HasFiles

* Updated PostStore.Update to be usable in more circumstances

* Re-added Filenames field and switched file migration to be entirely lazy-loaded

* Increased max listener count for FileStore

* Removed unused fileInfoCache

* Moved file system code back into api

* Removed duplicate test case

* Fixed unit test running on ports other than 8065

* Renamed HasPermissionToPostContext to HasPermissionToChannelByPostContext

* Refactored handleImages to make it more easily understandable

* Renamed getPostFiles to getFileInfosForPost

* Re-added pre-FileIds posts to analytics

* Changed files to be saved as their ids as opposed to id/filename.ext

* Renamed FileInfo.UserId to FileInfo.CreatorId

* Fixed detection of language in CodePreview

* Fixed switching between threads in the RHS not loading new files

* Add serverside protection against a rare bug where the client sends the same file twice for a single post

* Refactored the important parts of uploadFile api call into a function that can be called without a web context

webapp/components/rhs_comment.jsx

@@ -2,7 +2,7 @@
 // See License.txt for license information.
 
 import UserProfile from './user_profile.jsx';
-import FileAttachmentList from './file_attachment_list.jsx';
+import FileAttachmentListContainer from './file_attachment_list_container.jsx';
 import PendingPostOptions from 'components/post_view/components/pending_post_options.jsx';
 import PostMessageContainer from 'components/post_view/components/post_message_container.jsx';
 import ProfilePicture from 'components/profile_picture.jsx';
@@ -295,13 +295,11 @@ export default class RhsComment extends React.Component {
 
         var dropdown = this.createDropdown();
 
-        var fileAttachment;
-        if (post.filenames && post.filenames.length > 0) {
+        let fileAttachment = null;
+        if (post.file_ids && post.file_ids.length > 0) {
             fileAttachment = (
-                <FileAttachmentList
-                    filenames={post.filenames}
-                    channelId={post.channel_id}
-                    userId={post.user_id}
+                <FileAttachmentListContainer
+                    post={post}
                     compactDisplay={this.props.compactDisplay}
                 />
             );