feat: `Mode:exit` (#30)
* fix(Mode): adapt to changes in `timeoutlen`
* feat(libmodal): do `self:exit()` inside callback
* docs: `Mode:exit`
* style: .editorconfig
* docs(libmodal): fix broken example
* feat(Mode): `self:switch`
* docs: `Mode:switch`
* feat(libmodal): `mode.switch`
Wraps `Mode:switch` for convenience
* docs: `libmodal.mode.switch`
* docs(examples): `*.switch`
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