closes#380
* --features disable_automatic_asset_installation
disables automatic installation of the `data_dir`
* a set PREFIX env will use `$PREFIX/zellij` as its `data_dir`
* since darwin doesn't have distinct data and config
directories, assumptions that we had were invalid
* now the `HOME` config directory is loaded before the
system config directory, in this case populating the
data directory doesn't invalidate possible user configuration,
because the configuration directory now exists
* the simplified layout omits the Nerdfonts characters that are not
found in every Fontset
* add an optional config option to opt into the simplified ui
`simplified_ui: bool`
* add a config flag that allows opting into the simplified ui
`zellij options --simplified-ui`
* move the `clean` flag to the `setup` subcommand
New behavior for h and l, will change tabs if there are no available
panes in the direction.
cargo clippy
Ensuring atomicity for the MoveFocusOrTab
- Blocking the input thread for the action MoveFocusOrTab
- Using "unreachable" macro in match arm to make it clear that the
directions Up and Down should not be used with the action MoveFocusOrTab
Adding tests
* Moving the sync command to the Tab mode
* Fixing bug related to plugin panes and sync mode
When sync mode was enabled the input from a plugin pane was being
incorrectly ignored.
The default keybinds can be unbound either for a specific mode, or for every mode.
It supports either a list of `keybinds`, or a bool indicating that every keybind
should be unbound:
```
keybinds:
unbind: true
```
Will unbind every default binding.
```
keybinds:
unbind: [ Ctrl: 'p']
```
Will unbind every default `^P` binding for each mode.
```
keybinds:
normal:
- unbind: true
```
Will unbind every default keybind for the `normal` mode.
```
keybinds:
normal:
- unbind: [ Alt: 'n', Ctrl: 'g']
```
Will unbind every default keybind for `n` and `^g` for the `normal` mode.
