feat(infra): initial plugin system

- Added the ability to load and keep track of several plugins at once
- Removed `wasm-wip` feature flag, enabling plugins in all builds
- `split_space` now returns a tuple with the `part_position_and_size` (as before) plus a cloned version of the part, so plugins and terminals can be distinguished by its users
- Added a `Draw` instruction for rendering plugins when asked to by Mosaic
- Added a new `PluginPane`, implementing `Pane` for plugins!
- Replaced RawFd as a pane-identifier with the `PaneId` enum in most places
- `change_size` -> `change_pos_and_size`, with the functionality updated to fit the new name
- `buffer_as_vte_output` -> `render`
- `pid()` on the `Pane` trait now returns a `PaneId`
- Changed lots of functions in `tab.rs` to be more pane oriented, renaming some to remove the `terminal` and switching to `PaneId`s
- splitting functions in `tab.rs` now correctly update the positions of returned fragments
- Used `PaneId`'s as a replacement for `PaneKind` in the tab `BTreeMap`
- Removed `get_rows` and `get_columns` from the `Pane` trait
- Layouts can now create plugin panes!
- Changed lots of the `active_terminal` stuff in `tab.rs` to work with all panes
- Changed the `Tab` `render` function, so that common requirements are moved there and out of the `Pane::render()` methods
- Added a `shared.rs` to `utils` with a couple of useful functions
- We can now accept input and pass it to plugins via serialised JSON
- Trigger a screen render after handling input meant for a plugin
- Allow plugins to be properly closed
- Allow plugin panes to be split (opening a new terminal)
- Allow plugin API functions to send messages on the PTY bus
- Added the API functionality needed for a plugin to open a file in a new pane
- No more compiler warnings!
- Fixed 53 clippy lints!

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