New artifact types

• Completely different artifact types:

buildscript {
  ext.frice_version = 'v1.7.10'
}

// old, necessary
compile "com.github.icela:FriceEngine:$frice_version"
// new, optional, if you speak Kotlin
compile "com.github.icela:FriceEngine:$frice_version:sources"
// new, for java users
compile "com.github.icela:FriceEngine:$frice_version:all"
// new, optional
compile "com.github.icela:FriceEngine:$frice_version:javadoc"

• Enhancement: enable JfxImage only when GameFX is used.
• launchFx for GameFX to avoid naming conflicts.

See https://github.com/icela/FriceEngine/milestone/10?closed=1