v1.2.0 Methods simplification and debugging

Changes:

_ .setDigitsOrder() method newOrderSize parameter is removed as it didn't provided any needed information, minor incompatibility issues resulting in this change is preferred over keeping a backwards compatibility mechanism
_ _dspValMin and _dspValMax type changed from int to int32_t to ensure compatibility across different mcus and compilation settings.
_ All methods returning or using int values were changed to uint32_t where needed to ensure failsafe representation

Debugging:

_ Constructor dynamic memory asignation () misused, corrected.