* Changed extension for web from .bc to .a
I did this to support vcpkg expectation. When using the library from vcpkg for web you would install it using vcpkg install raylib:wasm32-emscripten but also vcpkg expects the output lib to be with .a extension instead of .bc
Doesn't make a difference for standalone builds or when raylib is used as a subdirectory dependency.
* Added headers to install targets to fix vcpkg usage
Currently vcpkg works by installing the cmake target into its packages directory. The problem is that install only copies the public header at this point so we need to add the others to the install targets.
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