feat: angular 7+ update (#1910)

Closes #1890

BREAKING CHANGES:
Angular 7+ now required.
The following libraries were updated:
- @agm/core
- @ng-bootstrap/ng-bootstrap
- @swimlane/ngx-charts
- ng2-ckeditor
- ngx-echarts

src/tsconfig.app.json

@@ -4,7 +4,6 @@
     "outDir": "../out-tsc/app",
     "module": "es2015",
     "baseUrl": "./",
-    "types": [],
     "paths": {
       "@angular/*": [
         "../node_modules/@angular/*"