Migrate to Java 11 baseline

[caprica]

Headline changes:

• Java 11 baseline for vlcj 4.8.x
• Java 11 baseline for vlcj-natives 4.8.x
• Java 11 baseline for vlcj 5.0.x
• Java 11 baseline for vlcj-natives 5.0.x
• Use the Java Module System
• Remove obsolete OsxFullScreenStrategy and vlcj-osx-stubs dependency
• Refine the module exports in vlcj-natives and vlcj, including any necessary package restructuring to accommodate it
• Move all examples in src/test/java to a 4.8 branch in the vlcj-examples project - or consider just deleting them as the 5.x examples will eventually become all that is needed. maintaining two branches just for examples is quite onerous
• Java 11 baseline and modules for vlcj-javafx
• Java 11 baseline and modules for vlcj-javafx-demo
• Java 11 baseline and modules for vlcj-player
• Java 11 baseline and modules for vlcj-native-streams
• All other ancillary projects, like vlcj-subs, vlcj-info, vlcj-mrls and so on, check them all
• vlcj-file-filters
• vlcj-mrls

Scope does not necessarily include any rewriting to use new language features, like try with resources, lambdas and so on.

Consider backporting new 5.x native discovery.

[caprica]

The plan is to make an initial 4.8.0 release to garner feedback from users on any difficulties introduced by the switch to using the Java Module System.

[caprica]

Already need a 4.8.1 release to switch from non-modular JNA dependencies to jna-jpms and jna-platform-jpms instead.

[caprica]

Potential issues around restricting access of vlcj-natives to vlcj only, e.g. libvlc_instance_t not exposed so MediaPlayer can not be sub-classed.