Add support for JMOD and JIMAGE archives

[pombredanne]

JMODs or Java Modules are zip files with a modified magic:
Instead of start with the zip 50 4B 03 04 they start with 4A 4D (e.g. JM) then 01 00 and then the zip header 50 4B 03 04
See also

• https://docs.oracle.com/javase/9/tools/jmod.htm#JSWOR-GUID-0A0BDFF6-BE34-461B-86EF-AAC9A555E2AE
• https://stackoverflow.com/questions/44732915/why-did-java-9-introduce-the-jmod-file-format