Jitsi widget: Add JitsiViewController, a dedicated widget viewer for jitsi widgets based on jitsi-meet sdk.

Riot/ViewController/Widgets/JitsiViewController.h

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+/*
+ Copyright 2017 Vector Creations Ltd
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+#import <MatrixKit/MatrixKit.h>
+
+#import <JitsiMeet/JitsiMeet.h>
+
+#import "WidgetManager.h"
+
+/**
+ The `JitsiViewController` is a specific VC for handling a jitsi widget using
+ jitsi-meet iOS SDK instead of displaying it in a webview like other scalar widgets.
+ */
+@interface JitsiViewController : MXKViewController <JitsiMeetViewDelegate>
+
+/**
+ The jitsi-meet SDK view.
+ */
+@property (weak, nonatomic) IBOutlet JitsiMeetView *jitsiMeetView;
+
+/**
+ Returns the `UINib` object initialized for a `JitsiViewController`.
+
+ @return The initialized `UINib` object or `nil` if there were errors during initialization
+ or the nib file could not be located.
+ */
++ (UINib *)nib;
+
+/**
+ Creates and returns a new `JitsiViewController` object.
+
+ @discussion This is the designated initializer for programmatic instantiation.
+ 
+ @param widget the jitsi widget containinf jitis conference information.
+ @return An initialized `JitsiViewController` object if successful, `nil` otherwise.
+ */
++ (instancetype)jitsiViewControllerForWidget:(Widget*)widget;
+
+/**
+ The jitsi widget displayed by this `JitsiViewController`.
+ */
+@property (nonatomic, readonly) Widget *widget;
+
+@end