new: [internal] Added new internal functions to be used by all export APIs in the future
new: [internal] Added new internal functions to be used by all export APIs in the future

- authenticate user via URL params if not already authenticated (to support legacy APIs)
- harvest parameters in a standardised way for filtering all export APIs

SteveClement/MISP,FloatingGhost/MISP,Rafiot/MISP,devnull-/MISP,MISP/MISP,devnull-/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,Rafiot/MISP,devnull-/MISP,devnull-/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,Rafiot/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,Rafiot/MISP,FIRSTdotorg/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP