Change all *RenderContexts to not be readonly for easier usage when implement-ing them in components

Author: Ben Grynhaus

libs/fabric/src/lib/components/command-bar/command-bar.component.ts

@@ -237,10 +237,10 @@ export interface ICommandBarItemOptions<TData = any>
 }
 
 export interface ICommandBarItemOptionsRenderContext {
-  readonly item: any;
-  readonly dismissMenu: (ev?: any, dismissAll?: boolean) => void;
+  item: any;
+  dismissMenu: (ev?: any, dismissAll?: boolean) => void;
 }
 
 export interface ICommandBarItemOptionsRenderIconContext {
-  readonly contextualMenuItem: IContextualMenuItem;
+  contextualMenuItem: IContextualMenuItem;
 }

libs/fabric/src/lib/components/grouped-list/grouped-list.component.ts

@@ -111,7 +111,7 @@ export class FabGroupedListComponent extends ReactWrapperComponent<IGroupedListP
 }
 
 export interface ICellRenderContext {
-  readonly nestingDepth?: number;
-  readonly item?: any;
-  readonly index?: number;
+  nestingDepth?: number;
+  item?: any;
+  index?: number;
 }

libs/fabric/src/lib/components/panel/panel.component.ts

@@ -171,6 +171,6 @@ export class FabPanelComponent extends ReactWrapperComponent<IPanelProps> implem
  * Counterpart of `IPanelHeaderRenderer`.
  */
 export interface IPanelHeaderRenderContext {
-  readonly props?: IPanelProps;
-  readonly headerTextId?: string | undefined;
+  props?: IPanelProps;
+  headerTextId?: string | undefined;
 }