i2c / spi patterns

Logic analyzer usecase

## I2C

```js
/I0_((?<scl>SCL)|(?<sda>SDA))/
```

* Generate test sequence
* detect `scl-sda` pattern
* implement swoosh markers Start/Stop/Addr/Data

## SPI

```js
/S0_((?<sck>SCK)|(?<mosi>MOSI)|(?<miso>MISO)|(?<cs>CS0))/
```

* generate test sequence
* detect `sck-mosi-miso-cs` pattern
* half duplex / full duplex
* multiple CS?
* mode 1, 2, 3, 4