Improve plugin features to support JavaFX 11

[Don-vip]

Follow-up of #16682

Having a giant 85Mb plugin that contain all native artifacts for all platforms (win,mac,linux) is not great.

Work started in [o34700:34704]

[Don-vip]

In 14383/josm:

see #16912 - openjfx plugin renamed to javafx[-platform]

[Don-vip]

In 14384/josm:

see #16912 - introduce native and virtual plugins using new Plugin-Platform and Plugin-Provides manifest entries

Use case: javafx-windows, javafx-osx and javafx-unixoid are three native plugins providing the virtual javafx plugin on which other plugins can depend

[sanchi]

In mac, even if the javafx-osx mac version is installed and activated, it does not work. I get message when starting JOSM that javafx is missing required by MicrosoftStreetside. Before if it worked and I have deleted and activated several times but it does not go.

[Don-vip]

I know, this ticket isn't fixed, this is work in progress.

[Don-vip]

In 14394/josm:

see #16912 - don't issue a "missing plugin" warning for JavaFX on Java 8

[Don-vip]

In 14395/josm:

see #16912 - proper resolution of virtual dependencies

[Don-vip]

Plugin part completed in [o34705-34714].

[Don-vip]

In 14770/josm:

see #16912 - Ignore HeadlessException with JavaFX components. Issue hard to solve and we're not interested by that

[Don-vip]

In 14776/josm:

see #16912 - Ignore HeadlessException with JavaFX components. Issue hard to solve and we're not interested by that

[Don-vip]

In 14778/josm:

see #16912 - filter plugins requiring JavaFX on Java < 11 and headless mode

[Don-vip]

In 14781/josm:

see #16912 - update javafx plugin name

[Don-vip]

In 16104/josm:

see #16912 - remove deprecated JavaFxMediaPlayer, moved in the javafx plugin