449487: New Extensibility Concept for Scout 
SvgField

Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=449487
Use member List instead of ArrayList (consitency)

Change-Id: Ic11ce83e692e3d6d810a6d1683a8237d13ddadac
Reviewed-on: https://git.eclipse.org/r/38224
Tested-by: Hudson CI
Reviewed-by: Claudio Guglielmo <claudio.guglielmo@bsiag.com>
Fixed @since version

Change-Id: Ia7deafddd72fe4fd1923daacacd8845ec548d7c8
Reviewed-on: https://git.eclipse.org/r/38223
Tested-by: Hudson CI
Reviewed-by: Claudio Guglielmo <claudio.guglielmo@bsiag.com>
Adjusted menu type constant

-> Now conforms with naming convention