Snapshot 23w15a

• Add description of filesystem API to README

• Remove the + word from kernel, saving 6 bytes

• Don't expose the BASE variable, saving 4 bytes

• Remove DROP from kernel, defining it as : drop dup - - ; (saves 7 bytes)

• Combine [ and ], saving 5 bytes

• Make compress.py print the number of bytes saved by compression

• Save 1 byte

• Simplify how we force yasm to emit push 0x89 in two bytes

• Save 1 byte

• Move EMIT out of the kernel, saving 12 bytes

• Move >IN to 7d00, saving 5 bytes.

• Don't use the uefix chainloader in the default build configuration.

Miniforth is now small enough to fit a partition table itself.