[EDELIVERY-11682] update CodeMirror to v6, remove @ctrl/ngx-codemirror + code cleanup

smp-angular/package-lock.json

smp-angular/package.json

smp-angular/src/app/app.component.ts

smp-angular/src/app/app.module.ts

...app/common/components/smp-editor/smp-editor.component.css

...pp/common/components/smp-editor/smp-editor.component.html

.../app/common/components/smp-editor/smp-editor.component.ts

...n/panels/membership-panel/membership-panel.component.html

smp-angular/src/app/common/theme-service/theme.service.ts

...dit-domain/domain-group-panel/domain-group.component.html

...gular/src/app/edit/edit-domain/edit-domain.component.html

.../group-resource-panel/group-resource-panel.component.html

.../src/app/edit/edit-resources/edit-resource.component.html

...ar/src/app/edit/edit-resources/edit-resource.component.ts

...r/src/app/edit/edit-resources/edit-resource.controller.ts

...rce-document-panel/resource-document-panel.component.html

...ource-document-panel/resource-document-panel.component.ts

...-document-panel/subresource-document-panel.component.html

...ce-document-panel/subresource-document-panel.component.ts

...ources/subresource-panel/subresource-panel.component.html