WIP feat: replace ng2-select2 => ngx-select-ex (#706)

* feat: replace ng2-select2 => ngx-select-ex

* feat: style the ngrx-select

* feat: replace secondary role select2

* feat: replace Select2OptionData => SelectOptionData

* feat: replace select2 => ngx-select in macro-tab component

* feat: replace select2 => ngx-select in keymap-tab component

* feat: fix styles

* chore: remove select2 from dependencies

* fix: macro editor overflow

* fix: set the same font size for the toggle button

* fix: overflow

* chore: use @ert78gb/ngx-select-ex version of ngx-select-ex

packages/uhk-web/.angular-cli.json

@@ -26,7 +26,6 @@
       ],
       "scripts": [
         "../node_modules/bootstrap/dist/js/bootstrap.js",
-        "../node_modules/select2/dist/js/select2.full.js",
         "../node_modules/nouislider/distribute/nouislider.js"
       ],
       "environmentSource": "environments/environment.ts",