* work
* work
* work
* work
* work
* more work
* work
* work
* work
* hack around stdin repeater
* refactor(sixel): rename sixel structs
* feat(sixel): render text above images
* fix(sixel): reap images once they're past the end of the scrollbuffer
* fix(sixel): display images in the middle of the line
* fix(sixel): render crash
* fix(sixel): react to SIGWINCH
* fix(sixel): behave properly in alternate screen mode
* fix(sixel): reap images on terminal reset
* feat(sixel): handle DECSDM
* fix(terminal): properly respond to XTSMGRAPHICS and device attributes with Sixel
* Add comment
* fix(sixel): hack for unknown event overflow until we fix the api
* feat(input): query terminal for all OSC 4 colors and respond to them in a buggy way
* fix(sixel): do not render corrupted image
* feat(input): improve STDIN queries
* fix(client): mistake in clear terminal attributes string
* fix(ansi): report correct number of supported color registers
* fix(sixel): reap images that are completely covered
* style(comment): fix name
* test(sixel): infra
* test(sixel): cases and fixes
* fix(sixel): forward dcs bytes to sixel parser
* refactor(client): ansi stdin parser
* refactor(output): cleanup
* some refactorings
* fix test
* refactor(grid): sixel-grid / sixel-image-store
* refactor(grid): grid debug method
* refactor(grid): move various logic to sixel.rs
* refactor(grid): remove unused methods
* fix(sixel): work with multiple users
* refactor(pane): remove unused z_index
* style(fmt): prepend unused variable
* style(fmt): rustfmt
* fix(tests): various apis
* chore(dependencies): use published version of sixel crates
* style(fmt): rustfmt
* style(fmt): rustfmt
* style(lint): make clippy happy
* style(lint): make clippy happy... again
* style(lint): make clippy happy... again (chapter 2)
* style(comment): remove unused
* fix(colors): export COLORTERM and respond to XTVERSION
* fix(test): color register count
* fix(stdin): adjust STDIN sleep times
Add ability to set `ENVIRONMENT VARIABLES` from the
config and the layout files.
example:
```
env:
ZELLIJ_CONFIG:
DEFAULT
```
or
```
env:
ZELLIJ_LAYOUT_NAME:
BUILD_SESSION
```
If two keys conflict (configuration and layout), then the key
from the layout is used.
fixes: #1059
