missionDefinition: small updates from project experiences

[MarAlder]

The following updates from the branch Project_Diabolo can merge into develop:

• constraintSettingsType:
  • rename referenceEndCondition to referenceEndConditionUID
  • revision of descriptions
• geographicPointConstraintType:
  • add uID attributes to the child elements
• missionDefinitionsType:
  • add detailed documentation (thanks @ErwinMoerland for this)
• missionPerformanceMapDefinitionType:
  • revision of descriptions
• missionSegmentEndConditionType:
  • revision of descriptions
  • add powerFraction, powerRemaining and powerConsumed
• missionSegmentBlockConstraintsType:
  • revision of descriptions
• missionSegmentBlockType:
  • revision of descriptions
• missionSegmentBlockType:
  • revision of descriptions
• flightPerformanceRequirementType:
  • revision of descriptions
  • renaming reqClassification to requirementClassification
  • extract restricted list of requirement values into new requirementClassificationType
• globalPerformanceCasesType:
  • revision of descriptions
• missionStartRunwayType:
  • revision of descriptions
• environmentType:
  • revision of descriptions
• specificConfigurationSegmentsType:
  • revision of descriptions
• specificConfigurationSegmentType:
  • revision of descriptions
  • releasedStoreType:
  • revision of descriptions