Use Self everywhere (#3787)

This turns on the clippy lint
[`clippy::use_self`](https://rust-lang.github.io/rust-clippy/v0.0.212/index.html#use_self)
and fixes it everywhere.

crates/eframe/src/native/glow_integration.rs

@@ -962,7 +962,7 @@ impl GlutinWindowContext {
         // help us start from scratch again if we fail context creation and go back to preferEgl or try with different config etc..
         // https://github.com/emilk/egui/pull/2541#issuecomment-1370767582
 
-        let mut slf = GlutinWindowContext {
+        let mut slf = Self {
             egui_ctx: egui_ctx.clone(),
             swap_interval,
             gl_config,

crates/eframe/src/native/wgpu_integration.rs

@@ -492,7 +492,7 @@ impl WgpuWinitRunning {
         #[cfg(feature = "puffin")]
         puffin::GlobalProfiler::lock().new_frame();
 
-        let WgpuWinitRunning {
+        let Self {
             app,
             integration,
             shared,

crates/eframe/src/web/web_logger.rs

@@ -7,7 +7,7 @@ impl WebLogger {
     /// Install a new `WebLogger`, piping all [`log`] events to the web console.
     pub fn init(filter: log::LevelFilter) -> Result<(), log::SetLoggerError> {
         log::set_max_level(filter);
-        log::set_boxed_logger(Box::new(WebLogger::new(filter)))
+        log::set_boxed_logger(Box::new(Self::new(filter)))
     }
 
     /// Create a new [`WebLogger`] with the given filter,

crates/eframe/src/web/web_runner.rs

@@ -205,14 +205,14 @@ enum EventToUnsubscribe {
 impl EventToUnsubscribe {
     pub fn unsubscribe(self) -> Result<(), JsValue> {
         match self {
-            EventToUnsubscribe::TargetEvent(handle) => {
+            Self::TargetEvent(handle) => {
                 handle.target.remove_event_listener_with_callback(
                     handle.event_name.as_str(),
                     handle.closure.as_ref().unchecked_ref(),
                 )?;
                 Ok(())
             }
-            EventToUnsubscribe::IntervalHandle(handle) => {
+            Self::IntervalHandle(handle) => {
                 let window = web_sys::window().unwrap();
                 window.clear_interval_with_handle(handle.handle);
                 Ok(())