Implement custom lightweight modal #230

Introduce a brand new lightweight and efficient modal component. It is
designed to be visually similar to the previous one to not introduce a
change in feel of the application in a patch release, but behind the
scenes it features:

- Enhanced application speed and reduced bundle size.
- New flexbox-driven layout, eliminating JS calculations.
- Composition API ready for Vue 3.0 #230.

Other changes:

- Adopt idiomatic Vue via `v-modal` binding.
- Add unit tests for both the modal and dialog.
- Remove `vue-js-modal` dependency in favor of the new implementation.
- Adjust modal shadow color to better match theme.
- Add `@vue/test-utils` for unit testing.

src/presentation/bootstrapping/Modules/VModalBootstrapper.ts

@@ -1,8 +0,0 @@
-import VModal from 'vue-js-modal';
-import { VueConstructor, IVueBootstrapper } from '../IVueBootstrapper';
-
-export class VModalBootstrapper implements IVueBootstrapper {
-  public bootstrap(vue: VueConstructor): void {
-    vue.use(VModal, { dynamic: true, injectModalsContainer: true });
-  }
-}