switch to signal and reactive forms

...e/components/site-parameters/site-parameters.component.ts

...app/gmm/spectra/components/content/content.component.html

...c/app/gmm/spectra/components/content/content.component.ts

...tra/components/control-panel/control-panel.component.html

...ectra/components/control-panel/control-panel.component.ts

...mponents/event-parameters/event-parameters.component.html

...components/event-parameters/event-parameters.component.ts

...onents/parameter-summary/parameter-summary.component.html

...mponents/parameter-summary/parameter-summary.component.ts

...components/path-parameters/path-parameters.component.html

...a/components/path-parameters/path-parameters.component.ts

...a/components/plots-settings/plots-settings.component.html

...tra/components/plots-settings/plots-settings.component.ts

...src/app/gmm/spectra/components/plots/plots.component.html

...s/src/app/gmm/spectra/components/plots/plots.component.ts

...components/site-parameters/site-parameters.component.html

...a/components/site-parameters/site-parameters.component.ts

...onents/source-parameters/source-parameters.component.html

...mponents/source-parameters/source-parameters.component.ts

...mp-apps/src/app/gmm/spectra/models/form-controls.model.ts