Orbit-early treatment in CollisionContext tool

[sawenzel]

Developments to allow treatment/inclusion of additional orbits before each timeframe start:

• A new option --earlyOrbits x will prepend x orbits with collisions before the firstOrbit asked
• It will also do the same in each individual timeframe collision context extracted from the global context
• Collisions falling within the 'earlyOrbit' range are always kept and not filtered out based on a maximal count filter

Some cleanup.

Some restructuring/simplification of DigitizationContext:

• less internal state
• timeframe boundary indices are generalized from (start, end) --> (start, end, previous) where previous is the index from which on this timeframe can still be influenced with an earlyOrbit criterion

[github-actions]

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