Complete feature `std-fs-io` in casper-types for wasm compilation

[gRoussac]

Remove filesystem I/O functionality from the std feature, and gate this behind a new feature std-fs-io which depends upon std.

Allows to compile types without from_file/to_file/sysconf/os clock

Remove compilation warnings for feat testing

Add lint-no-default-features/check-no-default-features

Add documentation on deploy_hash_arb