* start ledclone
* led cloning: clone scan areas from original led
main: show exceptions, better exit
* tune json schema for new option. somwe cleanup
* fix warnings and bug for framebuffer selection. thx to clang brought by new osx buikld on travis
* make ledclone feature work flawlessly for effects too. Effect sees the ledstring without cloned leds.
cloned leds will be inserted just before sending to leddevice
additional: remove warnings and fix code style
* fix warning
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