* Simple module compilation cache
* Fix base64 encoding bug
* Use warn! everywhere in cache system
* Remove unused import
* Temporary workaround for long path on Windows
* Remove unused import for non-windows builds
* Add command line argument to enable cache system + apply minor review feedback
* Fix compilation of wasmtime-environ from within wasmtime-jit.
Enable wasmtime-environ/std when wasmtime-jit's std feature is enabled.
Fixes#200.
* Fix wasmtime-debug build too.