Start page versions modal

src/app/components/version-modal/version-modal.component.html

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+<div class="container">
+    <div class="header">
+        <div class="title">Page Versions</div>
+        <button title="Close" class="close" (click)="dismiss()">
+            <i class="fa fa-times"></i>
+        </button>
+    </div>
+    <div class="contents">
+        <ion-list>
+            <ion-item button *ngFor="let version of pageVersions" (click)="onVersionClick(version)" [color]="selectedVersion === version ? 'primary' : ''">
+                <ion-label>
+                    <h4 style="font-weight: bold">
+                        #{{ version.versionNum }}
+                        <span class="version-date">({{ version.versionCreateDate.toLocaleString() }})</span>
+                        <span class="current-version"><i *ngIf="version.currentVersion" class="fa fa-asterisk" title="Current version"></i></span>
+                    </h4>
+                    <h5>{{ version.versionMessage }} by {{ version.userDisplay }}</h5>
+                </ion-label>
+            </ion-item>
+        </ion-list>
+        <div class="preview">
+            Page preview will be here.
+        </div>
+    </div>
+</div>