## Validator Changes
* no changes
## Other code changes
* Fix NPE ValueSetRenderer
* More fixes in StructureDefinition validation type characteristic
* Fix typo in ImplementationGuideDefinitionParameterComponent `Value`
***NO_CI***
## Validator Changes
* More fixing for Type Characteristics
## Other code changes
* Fix rendering of concept map code references
* Fix version conversion problem for MessageHeader.event
***NO_CI***
## Validator Changes
* no changes
## Other code changes
* Improved HTML compliance (img.alt)
* Improved example generation
* Improved handling of illegal parameters in ImplementationGuideDefinition
***NO_CI***
## Validator Changes
* More fixes to type characteristics
* Validator would hang on some specific xml inputs - no more
## Other code changes
* General: This release contains java code for the as yet unreleased R5 ballot (it's a precondition for releasing it)
* Snapshot Generator handle bindings on CodeableReferences
* Renderer: Don't always render OperationDefinition header
***NO_CI***
## Validator Changes
* Allow binding as a type characteristic for Extension
## Other code changes
* OID support refactoring
* Remove Contributor Datatype from R5
* R5 Build efficiency fixes
***NO_CI***
## Validator Changes
* fix erroneous type characteristics error in StructureDefinition.differentials
## Other code changes
* ValuesetExpansion: Pay attention to inactive property, and activeOnly parameter
* fix broken paths rendering extensions
* Process markdown in code definitions when rendering ValueSets
* Fix duplicate ids in generated questionnaires
* Add types to wildcard list
***NO_CI***
