added firebase and rudimentary leaderboard support

ios_plugins/godot_svc/src/godot_svc.mm

@@ -0,0 +1,41 @@
+/*************************************************************************/
+/*  godot_svc.mm                                                         */
+/*************************************************************************/
+#include "godot_svc.h"
+
+#import "platform/iphone/app_delegate.h"
+#import "platform/iphone/view_controller.h"
+#import "godot_svc_delegate.mm"
+#import <Foundation/Foundation.h>
+
+GodotSvc *GodotSvc::instance = NULL;
+GodotSvcDelegate *godot_svc_delegate = nil;
+void GodotSvc::_bind_methods() {
+    ClassDB::bind_method(D_METHOD("popup"), &GodotSvc::popup);
+    ClassDB::bind_method(D_METHOD("close"), &GodotSvc::close);
+}
+
+GodotSvc::GodotSvc() {
+    ERR_FAIL_COND(instance != NULL);
+    instance = this;
+	godot_svc_delegate = [[GodotSvcDelegate alloc] init];
+}
+
+void GodotSvc::popup(String url){
+    NSString *nsURL = [[NSString alloc] initWithUTF8String:url.utf8().get_data()];
+    [godot_svc_delegate loadSvc:nsURL];
+}
+
+void GodotSvc::close(){
+    [godot_svc_delegate closeSvc];
+}
+
+GodotSvc *GodotSvc::get_singleton() {
+	return instance;
+};
+
+GodotSvc::~GodotSvc() {
+    if (godot_svc_delegate) {
+		godot_svc_delegate = nil;
+	}
+}