Add EventLoopBuilder

This commit adds an `EventLoopBuilder` struct to simplify event loop
customization and providing options to it upon creation. It also
deprecates the use of `EventLoop::with_user_event` in favor of the same
method on new builder, and replaces old platforms specific extension
traits with the new ones on the `EventLoopBuilder`.

src/platform_impl/ios/event_loop.rs

@@ -69,8 +69,11 @@ pub struct EventLoop<T: 'static> {
     window_target: RootEventLoopWindowTarget<T>,
 }
 
+#[derive(Default, Debug, Copy, Clone, PartialEq, Hash)]
+pub(crate) struct PlatformSpecificEventLoopAttributes {}
+
 impl<T: 'static> EventLoop<T> {
-    pub fn new() -> EventLoop<T> {
+    pub(crate) fn new(_: &PlatformSpecificEventLoopAttributes) -> EventLoop<T> {
         static mut SINGLETON_INIT: bool = false;
         unsafe {
             assert_main_thread!("`EventLoop` can only be created on the main thread on iOS");

src/platform_impl/ios/mod.rs

@@ -78,8 +78,10 @@ mod window;
 
 use std::fmt;
 
-pub use self::{
-    event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget},
+pub(crate) use self::{
+    event_loop::{
+        EventLoop, EventLoopProxy, EventLoopWindowTarget, PlatformSpecificEventLoopAttributes,
+    },
     monitor::{MonitorHandle, VideoMode},
     window::{PlatformSpecificWindowBuilderAttributes, Window, WindowId},
 };