retroforth/RELEASE-NOTES

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# RetroForth 2021.11 Release Notes
# Core Language
- deprecated
NoEcho
- new words
h:fetch h:store w:fetch w:store
w:fetch-next w:store-next
h:fetch-next h:store-next
b:fetch-next b:store-next
s:fetch s:store
- dictionary
added d:source field
# VM
## nga-c: retro.c
- added optional support for multiple virtual processor cores
- started work on an optional ffi
- added optional support for unsigned numeric operations
- internal cleanups
- better error messages when socket device not present
- display warning when no code blocks are found in a source file
## nga-rust
- new implementation from bitmapper
# Documentation
- Updated Build instructions for Linux (re: FFI support & libdl)
- Updated the description & example for `a:to-string`
- `d:source` field now populated for all standard words
- fixed stack comment for `a:store`
# Other
- moved deprecated words to `interface/` instead of `package/extensions`
- added a tool to identify words missing `d:source` data
- start work on proper utf8 string support
- nga/unix: catch some signals for debugging purposes
- fix bugs in examplse
- retro-stats
- alternate-listener