Xxh-xxh

**xxh**
* New `+hhr` option to remove host xxh directory after disconnect

**xxhp**
* New `xxhp` package manager

**xxh-dev**
* README fixes

**All repos**
* License to BSD-2-Clause

**xxh**
* Fix help message

**xxh-shell-bash-zero**
* New bash-zero xxh shell added!

**xxh-shell-xonsh-appimage**
* New `xonsh.AppImage` build from xonsh master with fresh fixes
* Fix AttributeError (https://github.com/xxh/xxh-shell-xonsh-appimage/issues/1)

**xxh-shell-ALL**
* Fix: `curl` now follows redirect

**xxh-dev**
* New tests for bash-zero and zsh
* New `xde-test-fast` script

**xxh**
* New argument `+hf, ++host-execute-file` - execute script file placed on host and exit.
* New argument `+hc, ++host-execute-command` - execute command on host and exit.
* Fix scp uploading for dot files

**xxh-dev**
* New zsh basic tests
* Fix building order
* New CentOS container

**xxh-shell-sample**
* New arguments description and examples

**xxh-shell-zsh**
* New entrypoint `-c` (command) and `-f` (file)
* Fix entrypoint libs and scp case

**zsh-portable**
* New entrypoint with libs path and scp fixes

**xxh-shell-fish-appimage**
* Fix AppImage link
* Entrypoint check improved

**Features**
* Final step to reduce overhead while building and uploading plugins. Now plugins should have `build.xsh` script to make clean and portable `build` directory.

**Development environment**
* [Dev and test environment](https://github.com/xxh/xxh-dev) have extremely updated to work and test with group of xxh repos.

**Update**
* Please update your local `~/.xxh/xxh` and use `+if` to update hosts.