fixes#603, fixes#349
* The layout has now a unique `tabs` section,
that can be used, like the `parts` section,
everything that is not inside the tabs section
is assumed to be present on every single tab
that is opened.
This is a BREAKING CHANGE for people that use
custom `layouts` already, since the `tabs` section
is not optional - for clarity and intentionality reasons.
The functionality to specify multiple tabs is already there,
but is still gated behind a panic, until #621 is fixed.
So for now one tab can be specified to load on startup.
* The `NewTab` action can optionally be bound to open
a layout that is assumed to be in the new `tabs` section
This is a BREAKING CHANGE for people that have the
`NewTab` action already bound in the config file:
```
- action: [NewTab, ]
key: [F: 5,]
```
must now be specified as:
```
- action: [NewTab: ,]
key: [F: 5,]
```
Optionally a layout that should be opened on the new tab can be
specified:
```
- action: [NewTab: {
direction: Vertical,
parts: [ {direction: Horizontal, split_size: {Percent: 50}}, {direction: Horizontal, run: {command: {cmd: "htop"}}},],
key: [F: 6,]
```
or:
```
- action: [NewTab: {direction: Vertical, run: {command: {cmd: "htop"} }},]
key: [F: 7,]
```
or
```
- action: [NewTab: {
direction: Vertical,
parts: [ {direction: Vertical, split_size: {Percent: 25},run: {plugin: "strider" }}, {direction: Horizontal}],}, MoveFocus: Left,]
key: [F: 8,]
```