fix: cargo install rustpatcher on MacOS fails with LLVM error

[rustonbsd]

• added custom sections for macos win and linux (tested on macos)
• clippy fmt cleanup
• fix run twice issue on macos
• test custom section on linux
• [-] test custom section on windows
• add e2e test for supported platforms
• cargo release

cd rustpatcher/crates/rustpatcher/
git checkout macos-embed-region-error
cargo build --release --example simple
cargo run --release --bin rustpatcher sign ../../target/release/examples/simple --key-file ../../owner_key_example
../../target/release/examples/simple

[rustonbsd]

for some reason

cargo run --release --bin rustpatcher sign ../../target/release/examples/simple --key-file ../../owner_key_example

when run twice on macos works, once yields an error when running simple.
I will look into it tomorrow

[rustonbsd]

l64 apple linker always signs on arm: https://github.com/keith/ld64/blob/90cb020963ce62a84000b99362cbed36bd16adcd/src/ld/Options.cpp#L5683-L5685

[rustonbsd]

failing on windows:

error[E0432]: unresolved import `nix::libc`
  --> crates\rustpatcher\src\updater.rs:12:5
   |
12 | use nix::libc;
   |     ^^^^^^^^^ no `libc` in the root

error[E0433]: failed to resolve: could not find `libc` in `nix`
   --> crates\rustpatcher\src\updater.rs:183:28
    |
183 |             let res = nix::libc::execv(exe.as_ptr(), args.as_ptr());
    |                            ^^^^ could not find `libc` in `nix`

Some errors have detailed explanations: E0432, E0433.
For more information about an error, try `rustc --explain E0432`.
error: could not compile `rustpatcher` (lib) due to 2 previous errors
Error: Process completed with exit code 101.

will ignore for now and declare win as unsupported platform for the moment.