Removed Plexus component annotations, build-time annotation processing, Plexus-related tests and injection sites

Introduced provider component to conditionally pick impl based on classpath

Copied AetherModule to new org.eclipse.aether.impl.guice package and deprecated original class that now simply extends the new class

Moved Slf4jLoggerFactory into dedicated package to eliminate OSGi uses constraint from o.e.a.internal.impl on org.slf4j

Tweaked configuration for maven-bundle-plugin to explicitly import version [1.3,2) of com.google.inject*

Considered root artifact of dependency graph when looking out for cycles

Extended debug logging to mention class loader of extension in case it's different from the core loader

Used extension's original index as tiebreaker in case of equal priorities to preserve any potential semantics of input order

Introduced boolean configuration property aether.priority.implicit to use extension ordering as is

Introduced configuration properties aether.priority.* that are consulted when sorting components by their priority

Introduced DependencyCycle structure to report cyclic dependencies in CollectResult and DependencyResult