(fuse/fullscreen) Added [tooltip] & [iconTpl] inputs for customizing the Fullscreen trigger button

src/@fuse/components/fullscreen/fullscreen.component.html

@@ -1,7 +1,12 @@
 <!-- Button -->
 <button
     mat-icon-button
-    [matTooltip]="'Toggle Fullscreen'"
+    [matTooltip]="tooltip || 'Toggle Fullscreen'"
     (click)="toggleFullscreen()">
-    <mat-icon [svgIcon]="'heroicons_outline:arrows-expand'"></mat-icon>
+    <ng-container [ngTemplateOutlet]="iconTpl || defaultIconTpl"></ng-container>
 </button>
+
+<!-- Default icon -->
+<ng-template #defaultIconTpl>
+    <mat-icon [svgIcon]="'heroicons_outline:arrows-expand'"></mat-icon>
+</ng-template>

src/@fuse/components/fullscreen/fullscreen.component.ts

@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, Inject, OnInit, ViewEncapsulation } from '@angular/core';
+import { ChangeDetectionStrategy, Component, Inject, Input, OnInit, TemplateRef, ViewEncapsulation } from '@angular/core';
 import { DOCUMENT } from '@angular/common';
 import { FSDocument, FSDocumentElement } from '@fuse/components/fullscreen/fullscreen.types';
 
@@ -11,6 +11,8 @@ import { FSDocument, FSDocumentElement } from '@fuse/components/fullscreen/fulls
 })
 export class FuseFullscreenComponent implements OnInit
 {
+    @Input() iconTpl: TemplateRef<any>;
+    @Input() tooltip: string;
     private _fsDoc: FSDocument;
     private _fsDocEl: FSDocumentElement;
     private _isFullscreen: boolean = false;

src/@fuse/components/fullscreen/fullscreen.module.ts

@@ -3,15 +3,17 @@ import { MatButtonModule } from '@angular/material/button';
 import { MatIconModule } from '@angular/material/icon';
 import { MatTooltipModule } from '@angular/material/tooltip';
 import { FuseFullscreenComponent } from '@fuse/components/fullscreen/fullscreen.component';
+import { CommonModule } from '@angular/common';
 
 @NgModule({
     declarations: [
         FuseFullscreenComponent
     ],
-    imports     : [
+    imports: [
         MatButtonModule,
         MatIconModule,
-        MatTooltipModule
+        MatTooltipModule,
+        CommonModule
     ],
     exports     : [
         FuseFullscreenComponent