Adds VS App Center analytics + crash reporting

Currently tracks install, refresh, and update app events.

Pods/AppCenter/AppCenter-SDK-Apple/iOS/AppCenterCrashes.framework/Headers/MSCrashesDelegate.h

@@ -0,0 +1,65 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#import <Foundation/Foundation.h>
+
+@class MSCrashes;
+@class MSErrorReport;
+@class MSErrorAttachmentLog;
+
+@protocol MSCrashesDelegate <NSObject>
+
+@optional
+
+/**
+ * Callback method that will be called before processing errors.
+ *
+ * @param crashes The instance of MSCrashes.
+ * @param errorReport The errorReport that will be sent.
+ *
+ * @discussion Crashes will send logs to the server or discard/delete logs based on this method's return value.
+ */
+- (BOOL)crashes:(MSCrashes *)crashes shouldProcessErrorReport:(MSErrorReport *)errorReport;
+
+/**
+ * Callback method that will be called before each error will be send to the server.
+ *
+ * @param crashes The instance of MSCrashes.
+ * @param errorReport The errorReport that will be sent.
+ *
+ * @discussion Use this callback to display custom UI while crashes are sent to the server.
+ */
+- (void)crashes:(MSCrashes *)crashes willSendErrorReport:(MSErrorReport *)errorReport;
+
+/**
+ * Callback method that will be called in case the SDK was unable to send an error report to the server.
+ *
+ * @param crashes The instance of MSCrashes.
+ * @param errorReport The errorReport that App Center sent.
+ *
+ * @discussion Use this method to hide your custom UI.
+ */
+- (void)crashes:(MSCrashes *)crashes didSucceedSendingErrorReport:(MSErrorReport *)errorReport;
+
+/**
+ * Callback method that will be called in case the SDK was unable to send an error report to the server.
+ *
+ * @param crashes The instance of MSCrashes.
+ * @param errorReport The errorReport that App Center tried to send.
+ * @param error The error that occurred.
+ */
+- (void)crashes:(MSCrashes *)crashes didFailSendingErrorReport:(MSErrorReport *)errorReport withError:(NSError *)error;
+
+/**
+ * Method to get the attachments associated to an error report.
+ *
+ * @param crashes The instance of MSCrashes.
+ * @param errorReport The errorReport associated with the returned attachments.
+ *
+ * @return The attachments associated with the given error report or nil if the error report doesn't have any attachments.
+ *
+ * @discussion Implement this method if you want attachments to the given error report.
+ */
+- (NSArray<MSErrorAttachmentLog *> *)attachmentsWithCrashes:(MSCrashes *)crashes forErrorReport:(MSErrorReport *)errorReport;
+
+@end