Added progress bar to file downloads

Added two new API calls, to update the server to a particular version and to get the updater status

You can now update through the UI, and a status dialog displays after

src/app/updater/updater.component.ts

@@ -0,0 +1,62 @@
+import { Component, OnInit } from '@angular/core';
+import { PostsService } from 'app/posts.services';
+import { CURRENT_VERSION } from 'app/consts';
+import { MatDialog } from '@angular/material/dialog';
+import { UpdateProgressDialogComponent } from 'app/dialogs/update-progress-dialog/update-progress-dialog.component';
+@Component({
+  selector: 'app-updater',
+  templateUrl: './updater.component.html',
+  styleUrls: ['./updater.component.scss']
+})
+export class UpdaterComponent implements OnInit {
+
+  availableVersions = null;
+  availableVersionsFiltered = [];
+  versionsShowLimit = 5;
+  latestStableRelease = null;
+  selectedVersion = null;
+  CURRENT_VERSION = CURRENT_VERSION;
+
+  constructor(private postsService: PostsService, private dialog: MatDialog) { }
+
+  ngOnInit(): void {
+    this.getAvailableVersions();
+  }
+
+  updateServer() {
+    this.postsService.updateServer(this.selectedVersion).subscribe(res => {
+      if (res['success']) {
+        this.openUpdateProgressDialog();
+      }
+    });
+  }
+
+  getAvailableVersions() {
+    this.availableVersionsFiltered = [];
+    this.postsService.getAvailableRelease().subscribe(res => {
+      this.availableVersions = res;
+      for (let i = 0; i < this.availableVersions.length; i++) {
+        const currentVersion = this.availableVersions[i];
+        // if a stable release has not been found and the version is not "rc" (meaning it's stable) then set it as the stable release
+        if (!this.latestStableRelease && !currentVersion.tag_name.includes('rc')) {
+          this.latestStableRelease = currentVersion;
+          this.selectedVersion = this.latestStableRelease.tag_name;
+        }
+
+        if (this.latestStableRelease && i >= this.versionsShowLimit) {
+          break;
+        }
+
+        this.availableVersionsFiltered.push(currentVersion);
+      }
+    });
+  }
+
+  openUpdateProgressDialog() {
+    this.dialog.open(UpdateProgressDialogComponent, {
+      minWidth: '300px',
+      minHeight: '200px'
+    });
+  }
+
+}