* - add more drawing func to effect engine
- make provider rs232 less noisy
- json checks: remove utf8 conversion temporarly and make it compat with py3 again
* fix compile prob
* - disable device when error indecates that the problem is not solvable on reconnect
- introduce a preOpenDelay of 2 seconds (currently value is hardcoded)
* rs232:
- make preOpenDelay available via webui
- fix preOpenDelay
- add basic usb serial detection
* - revert 3819ae7
- fix schema files
* make json checks compat with utf8+bom
* make shutdown effect a bit more flexible