add a stack/queue library for the x16, that utilizes banked ram

[irmen]

Due to memory constraints for other targets, probably only have this available on the x16 that has ample banked ram available by default.

Here's a good base https://discord.com/channels/547559626024157184/926342257290903552/1255178967955148810

Can also add FIFO (ringbuffer) support routines to it.

See https://gist.github.com/adiee5/22bbc588cf5c5329ef57d6dd48a5fae8

[irmen]

in buffers.p8 ?

[irmen]

available in buffers.p8 now