Enable referencing of IColorConstant instances as color

[GoogleCodeExporter]

Spray uses an enum to define colors. The generator maps that to 
IColorConstants. The Spray DSL should directly refer to a JvmType and filter 
them by type IColorConstant.

{{{
... 
lineColor = Color
...

enum Color :
    BLACK = 'black' 
}}}

Change to:
{{{
Color : type = JvmTypeReference
}}}

Later this should be extended to compute the color by an Xbase expression.

Original issue reported on code.google.com by karsten....@googlemail.com on 2 Sep 2011 at 1:06

[GoogleCodeExporter]

Colors from IColorConstant can be referred by their lower-case simple name 
('black'), all others can be referred to by qualified field name 
(IColorConstant::BLACK)

This is configurable in principle, depending on the runtime implementation. A 
runtime must therefore implement IColorConstantTypeProvider.

User Guide:
http://code.google.com/a/eclipselabs.org/p/spray/wiki/UserGuide_Language_Layout

Original comment by karsten....@googlemail.com on 21 Sep 2011 at 9:02

• Changed state: Fixed