refactor(igxMask): cleanup/streamline parsing and input handling

- input parsing go through one method
- add drag and drop functionality
- set default value on mask prop

Author: jackofdiamond5

projects/igniteui-angular/src/lib/core/utils.ts

@@ -139,7 +139,13 @@ export const enum KEYCODES {
     RIGHT_ARROW = 39,
     DOWN_ARROW = 40,
     F2 = 113,
-    TAB = 9
+    TAB = 9,
+    Ctrl = 17,
+    Z = 90,
+    Y = 89,
+    X = 88,
+    BACKSPACE = 8,
+    DELETE = 46
 }
 
 /**

projects/igniteui-angular/src/lib/date-picker/date-picker.component.spec.ts

@@ -1148,9 +1148,9 @@ describe('IgxDatePicker', () => {
             const input = fixture.debugElement.query(By.directive(IgxInputDirective));
             expect(input).toBeDefined();
             datePicker.isSpinLoop = false;
-
             input.nativeElement.focus();
             UIInteractions.sendInput(input, '31-03-19');
+            fixture.detectChanges();
             expect(input.nativeElement.value).toBe('31-03-19');
 
             input.nativeElement.focus();