Introduced RepositoryLayoutFactory SPI and made basic repo connector use it to retrieve layout

Renamed TransportRequest to TransportTask etc. (requests usually have results, the Transporter methods are void so request/result doesn't really fit)

Introduced aether-transport-file and dropped aether-connector-file

Introduced module aether-transport-wagon and dropped aether-connector-wagon

Introduced aether-transport-classpath module hosting a ClasspathTransporterFactory

Introduced new TransporterFactory SPI along with a new basic connector building on top of it

Introduced TransferEvent.Builder.resetType() to ease generation of event sequence for a given transfer

Considered repository id for keys of in-memory status cache employed by DefaultUpdateCheckManager

Bug 406155 - Allow hooks for dependency collection to derive to null children when hook is no longer needed for sub graph

Updated session validation to account for nullability

Extended VersionFilterContext to expose the list of remote repositories that were contacted to collect the versions

Bug 406155 - Allow hooks for dependency collection to derive to null children when hook is no longer needed for sub graph

Revised API contract to allow DependencyManager, DependencySelector and DependencyTraverser to be null and derive to null