Clippy fixes (#2011)

* windows: bump winapi version

* windows: address dark_mode FIXMEs

use now available winapi structures

* clippy: fix clippy::upper_case_acronyms warnings

* clippy: fix needless_arbitrary_self_type warnings

* clippy: fix clone_on_copy warnings

* clippy: fix unnecessary_mut_passed warnings

* clippy: fix identity_op warnings

* clippy: fix misc warnings

* prefix rustdoc lints with rustdoc::

the prefix was introduced in Rust 1.52

* windows: silence file_drop_handler is never read warning

* clippy: fix from_over_into warnings

and a bit of naming simplification

* clippy: fix missing_safety_doc warnings

* make dummy() functions const

src/platform_impl/web/device.rs

@@ -2,7 +2,7 @@
 pub struct Id(pub i32);
 
 impl Id {
-    pub unsafe fn dummy() -> Self {
+    pub const unsafe fn dummy() -> Self {
         Id(0)
     }
 }

src/platform_impl/web/window.rs

@@ -344,7 +344,7 @@ impl Drop for Window {
 pub struct Id(pub(crate) u32);
 
 impl Id {
-    pub unsafe fn dummy() -> Id {
+    pub const unsafe fn dummy() -> Id {
         Id(0)
     }
 }