fixed some tests

src/fyrox/obsolete/custom_game_loop.md

@@ -24,7 +24,7 @@ Here is an example of custom game loop with comments that will guide your throug
 # use std::{sync::Arc};
 
 fn main() {
-    let event_loop = EventLoop::new();
+    let event_loop = EventLoop::new().unwrap();
 
     // Then initialize the engine.
     let graphics_context_params = GraphicsContextParams {

src/fyrox/scripting/executor.md

@@ -55,8 +55,9 @@ You can set window title when creating executor instance:
 # use fyrox::engine::executor::Executor;
 # use fyrox::window::WindowAttributes;
 # use fyrox::engine::GraphicsContextParams;
+# use fyrox::event_loop::EventLoop;
 let executor = Executor::from_params(
-    Default::default(),
+    EventLoop::new().unwrap(),
     GraphicsContextParams {
         window_attributes: WindowAttributes {
             title: "My Game".to_string(),

src/fyrox/sound/hrtf.md

@@ -28,11 +28,12 @@ Once it is loaded, all sounds in the scene will use the HRTF for rendering. The
 # extern crate fyrox;
 # use fyrox::scene::{
 #     graph::Graph,
-#     sound::{self, HrirSphere, HrtfRenderer, Renderer},
+#     sound::{self, HrirSphere, HrirSphereResource, HrirSphereResourceExt, HrtfRenderer, Renderer},
 # };
 # 
 fn use_hrtf(graph: &mut Graph) {
-    let hrir_sphere = HrirSphere::from_file("path/to/hrir.bin", sound::SAMPLE_RATE).unwrap();
+    let hrir_sphere = HrirSphereResource::from_hrir_sphere(
+        HrirSphere::from_file("path/to/hrir.bin", sound::SAMPLE_RATE).unwrap(), "path/to/hrir.bin".into());
     graph
         .sound_context
         .state()

src/fyrox/tutorials/fps/tutorial-1/tutorial-part-1.md

@@ -85,7 +85,7 @@ impl Game {
 
 fn main() {
     // Create event loop that will be used to "listen" events from the OS.
-    let event_loop = EventLoop::new();
+    let event_loop = EventLoop::new().unwrap();
 
     // Finally create an instance of the engine.
     let graphics_context_params = GraphicsContextParams {
@@ -194,7 +194,7 @@ Finally, we at the point where the interesting stuff happens - `fn main()`. We'r
 ```rust,no_run
 # extern crate fyrox;
 # use fyrox::event_loop::EventLoop;
-let event_loop = EventLoop::new();
+let event_loop = EventLoop::new().unwrap();
 ```
 
 The event loop is a "magic" thing that receives events from the operating system and feeds your application, this is a very 

src/fyrox/ui/button.md

@@ -85,14 +85,14 @@ useful:
 #     core::pool::Handle,
 #     event_loop::ControlFlow,
 #     gui::{button::ButtonMessage, message::UiMessage, UiNode},
-#     plugin::PluginContext,
+#     plugin::{PluginContext, Plugin},
 # };
 # 
 struct Game {
     button: Handle<UiNode>,
 }
 
-impl Game {
+impl Plugin for Game {
     fn on_ui_message(
         &mut self,
         context: &mut PluginContext,