This is the first step in supporting both dmx input and dmx output on different pins.

This greatly improves readability because it gets rid of most of the
ifdefs.

Some minor cleanup changes

This is much nicer to read and in the future more state will be added to support all the rdm stuff.

The current release/v3.1 is buggy and cannot receive dmx.
Until that is fixed we are sticking to the last working commit

This fixes a crash in the dmx receiver. The dmx receiver cannot work while cache is disabled. For some reason activating wifi disables the cache. In theory, the driver is placed in iram and should work, but it doesn't. This might be a bug in the driver.

Some rdm testers disconnect after setting it.

No longer needed because missing ISR_ATTR have been added to esp_dmx.

This was necessary because otherwise it is not able to respond to rdm in time.

This reverts commit e3f256b.