Convert imports to ES6 from CommonJS

This is needed because `require()` means something different in webpack - it ends up importing the module as something we didn't expect (and is occasionally async)

src/autocomplete/CommunityProvider.js

@@ -46,7 +46,7 @@ export default class CommunityProvider extends AutocompleteProvider {
         });
     }
 
-    async getCompletions(query: string, selection: SelectionRange, force?: boolean = false): Array<Completion> {
+    async getCompletions(query: string, selection: SelectionRange, force: boolean = false): Array<Completion> {
         const BaseAvatar = sdk.getComponent('views.avatars.BaseAvatar');
 
         // Disable autocompletions when composing commands because of various issues

src/autocomplete/DuckDuckGoProvider.js

@@ -37,7 +37,7 @@ export default class DuckDuckGoProvider extends AutocompleteProvider {
          + `&format=json&no_redirect=1&no_html=1&t=${encodeURIComponent(REFERRER)}`;
     }
 
-    async getCompletions(query: string, selection: SelectionRange, force?: boolean = false) {
+    async getCompletions(query: string, selection: SelectionRange, force: boolean = false) {
         const {command, range} = this.getCurrentCommand(query, selection);
         if (!query || !command) {
             return [];

src/autocomplete/NotifProvider.js

@@ -30,7 +30,7 @@ export default class NotifProvider extends AutocompleteProvider {
         this.room = room;
     }
 
-    async getCompletions(query: string, selection: SelectionRange, force?:boolean = false): Array<Completion> {
+    async getCompletions(query: string, selection: SelectionRange, force:boolean = false): Array<Completion> {
         const RoomAvatar = sdk.getComponent('views.avatars.RoomAvatar');
 
         const client = MatrixClientPeg.get();

src/autocomplete/RoomProvider.js

@@ -48,7 +48,7 @@ export default class RoomProvider extends AutocompleteProvider {
         });
     }
 
-    async getCompletions(query: string, selection: SelectionRange, force?: boolean = false): Array<Completion> {
+    async getCompletions(query: string, selection: SelectionRange, force: boolean = false): Array<Completion> {
         const RoomAvatar = sdk.getComponent('views.avatars.RoomAvatar');
 
         const client = MatrixClientPeg.get();

src/autocomplete/UserProvider.js

@@ -91,7 +91,7 @@ export default class UserProvider extends AutocompleteProvider {
         this.users = null;
     }
 
-    async getCompletions(query: string, selection: SelectionRange, force?: boolean = false): Array<Completion> {
+    async getCompletions(query: string, selection: SelectionRange, force: boolean = false): Array<Completion> {
         const MemberAvatar = sdk.getComponent('views.avatars.MemberAvatar');
 
         // lazy-load user list into matcher