[WIP] see below + not tested | IPrint interface + Cam class + ...

BIG 1. IPrint "interface" class containg signals,methods for printing to console + error handling
BIG 2. Cam class with signals,methods for camera control -> mv all cam stuff out of core -> core only handles cam list

- cam(int) as getter/setter. rm curCam,camIdx
- add setduration
- add getNumber + getLine to CMD
- fix destdir in profile