Contract Configurator 0.3.0

• Support for ContractBehaviour - extensible behaviours at the contract level.
• Support for a persistent data store.
• Support for disabling other contract types
• Support for contract level notes.
• Support for using TextGen generated descriptions.
• Added Timer parameter.
• Added Expression requirement.
• Added SpawnKerbal behaviour.
• Added Expression behaviour.
• Added cooldownDuration to CompleteContract requirement.
• Added weight to CONTRACT_TYPE to support genering some contract types with higher/lower probability.
• Increase the odds of a ContractConfigurator contract being generated (versus a stock or traditionally defined contract) based on the number of configured contracts.
• VesselParameterGroup now works with deeply nested children (previously would only work with direct children).
• Various minor bug-fixes.