retroforth/RELEASE-NOTES

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# RetroForth 2021.7 (In-Progress) Release Notes
## Core Language
## Major Changes
- address 5 is now a pointer to `interpret`
- address 6 is now a pointor to `err:notfound`
## Added
- `if:` and `-if:`
- `c:get` to retro.forth
- `s:get` to retro.forth
- `listen` to retro.forth
## Renamed
## I/O
## Toolchain
## VM
- nga-c
- retro.c no longer does dictionary searches to find
needed resources in image
- shift instruction no longer using an unneeded multiply
(Arland Childers)
- retro-repl.c now uses an external image
- removed barebones.c (overlaps w/new retro-repl.c)
- nga-nim
- fix bug in VM_SH
- minor formatting adjustments
- start work to report some errors
## Examples
- add archive, archive-info, archive-extract
- add delete-file
- variables-and-formulas now in UTF8 (Marcus Antonius)
## Documentation
- removed references to old command line arguments
- removed reference to the no longer existing "ok" prompt
- add a note that mentions that Retro does not display a prompt