* update docs
* add sign to intActivationTypes
* add RTTI macro
* update backend test
* add type prp test
* add visitor test
* add visitor and type_prop test to CMakeList
* add sign to constants.py
* delete backend tests and create new reference tests
* style fix
* remoove sign backend test from CMakeList
* create reference test for all supported types
* remove boolean type from evaluate method