Feat/model backed ui (#1145)

This is an initial PR for a new model-driven UI where extensions can provide definitions of the components & how they're laid out using Containers.
#1140, #1141, #1142, #1143 and #1144 are all tracking additional work needed to improve the initial implementation and fix some issues with the implementation.

Features:
- Supports defining a FlexContainer that maps to a flexbox-based layout.
- Supports creating a card component, which is a key-value pair based control that will lay out simple information to a user. Eventually this will have an optional set of actions associated with it.
- Has a sample project which shows how to use the API and was used for verification

src/sql/parts/modelComponents/card.component.ts

@@ -0,0 +1,68 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+import 'vs/css!./flexContainer';
+
+import { Component, Input, Inject, ChangeDetectorRef, forwardRef, ComponentFactoryResolver,
+	ViewChild, ViewChildren, ElementRef, Injector, OnDestroy, QueryList,
+} from '@angular/core';
+
+import * as sqlops from 'sqlops';
+
+import { DashboardServiceInterface } from 'sql/parts/dashboard/services/dashboardServiceInterface.service';
+import { ComponentBase } from 'sql/parts/modelComponents/componentBase';
+import { IComponent, IComponentDescriptor, IModelStore } from 'sql/parts/modelComponents/interfaces';
+
+@Component({
+	template: `
+		<div *ngIf="label" class="cardComponent" style="position: absolute; height: 100%; width: 100%; margin: 10px 0px 10px 0px;">
+			<span style="margin-left: 10px; display: inline-block;">
+				<div style="font-size: 11px; font-weight: lighter">{{label}}</div>
+				<div>{{value}}</div>
+			</span>
+		</div>
+	`
+})
+export default class CardComponent extends ComponentBase implements IComponent, OnDestroy {
+	@Input() descriptor: IComponentDescriptor;
+	@Input() modelStore: IModelStore;
+
+	constructor(@Inject(forwardRef(() => ChangeDetectorRef)) changeRef: ChangeDetectorRef) {
+		super(changeRef);
+	}
+
+	ngOnInit(): void {
+		this.baseInit();
+	}
+
+	ngOnDestroy(): void {
+		this.baseDestroy();
+	}
+
+	/// IComponent implementation
+
+	public layout(): void {
+		this._changeRef.detectChanges();
+	}
+
+	public setLayout (layout: any): void {
+		// TODO allow configuring the look and feel
+		this.layout();
+	}
+
+	// CSS-bound properties
+
+	public get label(): string {
+		return this.getPropertyOrDefault<sqlops.CardProperties, string>((props) => props.label, '');
+	}
+
+	public get value(): string {
+		return this.getPropertyOrDefault<sqlops.CardProperties, string>((props) => props.value, '');
+	}
+
+	public get actions(): sqlops.ActionDescriptor[] {
+		return this.getPropertyOrDefault<sqlops.CardProperties, sqlops.ActionDescriptor[]>((props) => props.actions, []);
+	}
+
+}