The program's first argument is not guaranteed to be a path to the
current executable.

Also, at least on Linux, `std::env::current_exe()` is able to correctly
find the new location of the executable if the user moves the executable
before the panic handler runs.

Setting this to `forbid` seems to break clippy when using wasm-bindgen.
I'm setting this to `warn` so we can see clippy lints for crates that
depend on luminol-web in web builds.

…6f12f13605de26f214

Without this, the Git version will always have "-modified" at the end in
web builds even if the code is unmodified, because the Trunk hooks
modify .cargo/config.toml.

Luminol can now be run offline after loading it in a browser once.

This fixes a problem where sometimes, either cross-origin isolation
would not be enabled at all or sw.js would have its own COEP (but not
the COEP for other files) set to require-corp instead of credentialless.
This would be fixed by refreshing the page a number of times.

Now, COI should always be enabled and the COEP for sw.js should always
be credentialless, without the user having to refresh the page: the page
is automatically refreshed.

Haha, turns out we don't even need credentialless COEP to send no-cors
requests! The require-corp COEP works just fine.

After further testing, it seems Firefox does require credentialless COEP
for this type of no-cors request, so Chromium allowing it is probably a
bug.

This fixes some edge cases I experienced when testing in Firefox where
the user refreshing the page sometimes causes the page's COEP to revert
to "require-corp" (the service worker is supposed to set it to
"credentialless").

I hate web development so much.

This fixes a bug where updating one of the HTML or JavaScript files
(which changes the output of the `luminol_core::version!` macro) doesn't
cause every crate that uses the `luminol_core::version!` macro to be
recompiled, resulting in parts of Luminol getting different Git revision
strings from this macro.

This prevents the Git revision from being miscalculated if some of the
crates are at a different version than others.

Since wgpu errors result in panics, this seems like a useful thing to
have.