Resolve "Extend current SuperStupidStack to work for first paticle cascade"

Closes #69

See merge request AirShowerPhysics/corsika!19

Resolve "Rename geometry::BaseTrajectory into something else, maybe "BaseTrack""

Closes #44

See merge request AirShowerPhysics/corsika!18

fixing cmake build

Closes #60

See merge request !16

some changes to geometry interface

See merge request !13

Different types of processes

See merge request AirShowerPhysics/corsika!12

Resolve "Tag milestone 1"

Closes #49

See merge request !11

# Conflicts:
#   Stack/SuperStupidStack/SuperStupidStack.h

Resolve "Coding style"

Closes #31

See merge request AirShowerPhysics/corsika!7