||Plugin loader that can find plugins via a single URL, and treats all plugins loaded from
the directory as bundled plugins, meaning they can can be upgraded, but not deleted.
||Loads plugins from the classpath
||A plugin loader to load plugins from a directory on disk.
||Scans the filesystem for changed or added plugin files and stores a map of the currently known ones.
||A scanner that simply scans a given set of input files.
||Plugin loader that delegates the detection of plugins to a Scanner instance.
||Loads a single plugin from the descriptor provided, which can either be an InputStream
or a resource on the classpath.