Add jlinkOptions configuration

[abhinayagarwal]

Fix #104

[betanzos]

Test method JavaFXRunMojoTestCase#testSplitComplexArgumentString() should be removed as the same test was created in JavaFXBaseMojoTest class.

[HGuillemet]

PR tested and working, but see related issue in this comment:
when we want to add all module path to the image and to the module graph, we need <option>--add-modules ALL-MODULE-PATH</option> for the run target and <option>--add-module ALL-SYSTEM-PATH</option> for the jlink target (launcher option). Unless I missed something, It's not possible currently to configure two different values for <option>.
What about a runOption and launcherOption instead of (or in addition to) option ?

[abhinayagarwal]

In this case, runOption and launcherOption seems like the only way out.

Having said that, option is provided by default to all configuration and cannot be removed. Will this create confusion to future users of the plugin (as its usage will be deprecated but the parameter will still be present) ?

[HGuillemet]

You can keep option without deprecating it, as a way to specify common options to both goals. And add runOption and launcherOption just for specific ones.

[HGuillemet]

Could we move on about this issue ? Would you be interested in a PR adding runOption and launcherOption ?