v0.2.1-alpha0

Tooling has improved to be more UX friendly.

New features:

* fuse, tool: create & load multi-image filesystems
* fuse, tool: a key file can be saved & provided to skip key derivation
* tool: argon2id parameters are configurable
* tool: dump shows more filesystem-wide info
* fuse: implement statfs
* fuse: add option to control cache size

Fixes:

* fuse: use rwx-r-xr-x permissions as default
* nros: fix block count mismatch between chains

Release v0.2

* Completely overhauled the cache.
  The cache itself is now fully concurrent,
  which allows it to handle concurrent I/O requests
  as well as make use of parallelism to improve throughput.
  * The FUSE driver does not make explicit use of this feature yet
    though.
* Added encryption.
  Originally, encryption was not going to be implemented and instead
  left over to block drivers.
  However, after some consideration it was decided it would be
  beneficial to support encryption directly to improve performance.
  and for ease of use.
  While a key can either be derived from a password or supplied
  directly, the tools currently only support passwords.
* Add support for mirroring and error correction.
  The tools do not expose any options for multi-disk setups however.
  This will be implemented in v0.2.1

Account for block size in FUSE driver