- #8419
- perform batching and `@(ServiceFileReference)` and `@(Compile)` additions in common code
- take advantage of new simplicity in `DefaultDocumentGenerator` target
- add metadata serialization / deserialization in support of passing items into `<MSBuild />`
- also ensure metadata values are escaped before calling `ITaskItem.SetMetadata(...)`
- correct typos in Microsoft.Extensions.ApiDescription.Client.* e.g. in comments and metadata names
- move last remaining `GenerationTasks` file
nits:
- combine `_ServiceProjectReferenceGenerator_Restore` and `_ServiceProjectReferenceGenerator_Build` targets
- only build web sites projects once
- remove unused `buildMultiTargeting` targets
- remove qualification of metadata listed in an `<ItemDefinitionGroup />`; will always exist
- add / remove a few `Condition`s that were missing / redundant
- move properties users won't normally set to Microsoft.Extensions.ApiDescription.Client.targets
- shorten lines in MSBuild files
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