MarlinFX upgrade 0.7.5

[Laurent Bourgès]

Hi,

Please review this MarlinFX upgrade to Marlin 0.7.5:

JBS: no bug yet for OpenJFX 10
webrev: http://cr.openjdk.java.net/~lbourges/marlinFX/marlinFX-075.0/

Changes:
- Renderers: fixed block processing
- dead code & few comment removals in Strokers
- fixed all floating-point number literals to be x.0f or x.0d to simplify
the conversion between float & double variants

PS: I plan to run later FindBugs, Netbeans & IntelliJ code analysis tools
to fix any warning

Cheers,
Laurent