BEHAVIOR CHANGE! Move to new default method using the NIOS trim bit cache.
This removes FLAG_FORCE_MASKED and introduces FLAG_FORCE_UNMASKED. Not
setting a flag will now result in using the NIOS trim cache instead of
not masking the chips and every pixel after calibrating.
Change var type of trim cache from "char" to "uint8_t".
Increase version to 2.19
FW 2.19: behavior change concerning mask state of pixels (FLAG_FORCE_UNMASKED
instead of FLAG_FORCE_MASKED) and changed trim cache variable type.