Rework slickgrid keyboard navigation (#1930)

* rewrite keybind nav to handle ctrl + home and end

* testing different options

* working on removed slickgrid changes we don't need

* formatting

* handle click handler to rowNumber

* fixing various bugs

* formatting

* readd click column to select

* add shift key to column select

* added logic for additional keybindings on grid

* add down and up arrow into keyboard navigation

* update styling and update slickgrid

* formatting

* update angular-slickgrid version

* remove index.js changes

src/typings/modules/angular2-slickgrid/index.d.ts

@@ -81,6 +81,11 @@ export interface IColumnDefinition {
     formatter?: (row: number, cell: any, value: any, columnDef: any, dataContext: any) => string;
     isEditable?: boolean;
 }
+
+export interface ISlickColumn<T> extends Slick.Column<T> {
+    isEditable?: boolean;
+}
+
 export interface IGridColumnDefinition {
     id: string;
     type: number;