fix(*); Cleanup a bit empty imports and other minor things.

Author: skrustev

projects/igniteui-angular/src/lib/calendar/calendar.component.ts

@@ -9,7 +9,6 @@ import {
 	AfterViewInit,
 	ViewChildren,
 	QueryList,
-	OnDestroy,
 	booleanAttribute,
     HostListener,
 } from '@angular/core';

projects/igniteui-angular/src/lib/calendar/month-picker/month-picker.component.ts

@@ -6,7 +6,6 @@ import {
     Input,
     ElementRef,
     AfterViewInit,
-    OnDestroy,
     OnInit,
 } from "@angular/core";
 import { NgTemplateOutlet } from "@angular/common";

projects/igniteui-angular/src/lib/date-range-picker/date-range-picker-inputs.common.ts

@@ -10,7 +10,7 @@ import { IgxIconComponent } from '../icon/icon.component';
 import { IgxSuffixDirective } from '../directives/suffix/suffix.directive';
 import { IgxButtonDirective } from '../directives/button/button.directive';
 import { IgxPrefixDirective } from '../directives/prefix/prefix.directive';
-import { NgTemplateOutlet, NgClass } from '@angular/common';
+import { NgTemplateOutlet } from '@angular/common';
 
 /** Represents a range between two dates. */
 export interface DateRange {

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-data-selector.component.ts

@@ -47,7 +47,6 @@ import { IgxIconComponent } from "../../icon/icon.component";
 import { IgxInputGroupComponent } from "../../input-group/input-group.component";
 import { fadeIn, fadeOut } from 'igniteui-angular/animations';
 import { Size } from '../common/enums';
-import { GridColumnDataType } from '../../data-operations/data-util';
 
 interface IDataSelectorPanel {
     name: string;

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-header-row.component.ts

@@ -38,7 +38,6 @@ import { IgxDropDirective } from '../../directives/drag-drop/drag-drop.directive
 import { NgTemplateOutlet, NgClass, NgStyle } from '@angular/common';
 import { IgxPivotRowHeaderGroupComponent } from './pivot-row-header-group.component';
 import { IgxPivotRowDimensionHeaderGroupComponent } from './pivot-row-dimension-header-group.component';
-import { GridColumnDataType } from '../../data-operations/data-util';
 
 /**
  *

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-util.ts

@@ -3,7 +3,7 @@ import { DataUtil, GridColumnDataType } from '../../data-operations/data-util';
 import { FilteringLogic } from '../../data-operations/filtering-expression.interface';
 import { FilteringExpressionsTree } from '../../data-operations/filtering-expressions-tree';
 import { ISortingExpression } from '../../data-operations/sorting-strategy';
-import { ColumnType, PivotGridType } from '../common/grid.interface';
+import { PivotGridType } from '../common/grid.interface';
 import { IGridSortingStrategy, IgxSorting } from '../common/strategy';
 import { IgxPivotAggregate, IgxPivotDateAggregate, IgxPivotNumericAggregate, IgxPivotTimeAggregate } from './pivot-grid-aggregate';
 import { IPivotAggregator, IPivotConfiguration, IPivotDimension, IPivotGridRecord, IPivotKeys, IPivotValue, PivotDimensionType, PivotSummaryPosition } from './pivot-grid.interface';

projects/igniteui-angular/src/lib/input-group/input-group.component.ts

@@ -1,4 +1,4 @@
-import { NgTemplateOutlet, NgClass } from '@angular/common';
+import { NgTemplateOutlet } from '@angular/common';
 import {
     ChangeDetectorRef,
     Component,
@@ -377,7 +377,7 @@ export class IgxInputGroupComponent implements IgxInputGroupBase, AfterContentCh
 
     /** @hidden @internal */
     public get fileNames() {
-        return this.input.fileNames || this._resourceStrings.igx_input_file_placeholder;
+        return this.input.fileNames || this.resourceStrings.igx_input_file_placeholder;
     }
 
     /**

projects/igniteui-angular/src/lib/progressbar/progressbar.component.ts

@@ -9,7 +9,6 @@ import {
     Renderer2,
     ViewChild,
     ContentChild,
-    AfterViewInit,
     AfterContentInit,
     Directive,
     booleanAttribute,