Add empty operator WriteGpio
Add empty operator ReadGpio
Add GPIO helper functions
Write GPIO
Support gpio parameter
Rename 'Trigger' to 'Block'
Fix trigger data traits
Add first version of ConstData operator
Add empty test for ConstData operator
Fix XML documentation
Implement and test ConstData operator
Fix description in block operator
Block operator supports (non working) trigger input
Implement trigger input of block operator, implement read GPIO operator
Add empty files fro GpioTrigger
Implement gpio trigger
Reenable zip file tests after openSUSE bug has been fixed
Remove redundant dependencies in cmake files
Add trigger flag to block operator
Fix direction of gpios in read operators