[misc] Lock down more Maven plugins
[misc] Switch to annotations instead of custom javadoc tags
[refactoring] Extract XWikiContext management code from the Importer to a separate utility class
Rename the short plugin name to something more specific
[refactoring] Extracted smaller methods from a huge one
[cleanup] Corrected indentation
[cleanup] Removed useless comments
Fixed build, now Mojos are correctly detected when building with Maven < 3.2