Moved stuff around, changed the way I'm storing milestones data

src/services/filters.service.ts

@@ -0,0 +1,25 @@
+import { Injectable } from '@angular/core';
+import { Subject } from 'rxjs';
+import { KeyValue } from '../models/key-value';
+
+@Injectable({ providedIn: 'root' })
+export class FilterService {
+  private _values: KeyValue[] = [];
+  private set filters(value: KeyValue[]) {
+    this._values = value;
+    this.filterSubject.next(this._values);
+  }
+  private get filters(): KeyValue[] {
+    return this._values;
+  }
+  private filterSubject = new Subject<KeyValue[]>();
+  readonly filters$ = this.filterSubject.asObservable();
+
+  constructor() {}
+
+  set(key: string, value: any): void {
+    const update = this.filters.filter((f: KeyValue) => f.key !== key);
+    if (!!value) update.push(new KeyValue({ key: key, value: value }));
+    this.filters = update;
+  }
+}