[State] Refactor distribution parameter and impl
Refactor distribution parameter and impl in package org.vadere.state.scenario.distribution
:
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Some parameters use 'frequency' but they actually describe a period or an interval, e.g. update frequency instead of update period / inter spawn time. Find a better wording. -
Generalize the classes contained in this package such that the naming applies to spawning and absorption (or any other) processes.