* minor changes in Op class and add ref impl for acosh
* acosh in new test framework
* add Acosh type test
* add SLT for Acosh
* run more test
* new acosh plugin test
* add visitor test
* fix test utils
* add template test for all supported types in Acosh
* add builder to template tests
* update grn template_plugin test
* update maste to feature branch
* 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