A safe and simple header-only K-V store

(slowdb is called "slowdb" not because it is slow, but because it is not blazingly fast)

Key-Value storage in C:

• simple
• tiny
• hash table of keys to file offsets
• persistent: writes are instantly written to the disk
• compression: automatically selects between strpakck, unishox2, and LZ4 compression
• NOT concurrent
• MIT-licenced (except for when you use a specific optional compression library)