Add (preliminary, limited) support for FLAG_FORCE_MASKED in trigger loops.
Passing the flag results in only one pixel being active at a time. Beware:
 * currently only trims the pixels with trimbits 15, threshold might be off
 * currently does not take into account that some pixels are masked completely
Both features will be addressed soon.
INcreasing SW version to 2.3, adding flash file.
Merge branch 'master' of github.com:psi46/pixel-dtb-firmware