sigil.properties -defaults should support variable expansion to allow it to be 
overriden
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                 Key: FELIX-1383
                 URL: https://issues.apache.org/jira/browse/FELIX-1383
             Project: Felix
          Issue Type: Improvement
          Components: Sigil
            Reporter: Derek Baum
            Priority: Minor


sigil.properties files support a directive:

-defaults: [-]path-to-defaults

which allows for default values (such as default package import versions) to be 
inherited.

If -defaults is not specified, '-../sigil-defaults.properties' is used to 
implicitly use defaults from parent.
The leading - means ignore error if the file is not found.

It would be useful if the defaults value was variable expanded against System 
properties and the environment:

-defaults: ${DEFAULTS_DIR:-../common}/sigil-defaults.properties

sigil already contains the necessary property variable expansion code.
however, property variable expansion is NOT globally applied to all values in 
sigil.properties, as the eclipse plugin is not aware of variable expansion, so 
when it updates sigil.properties all variables would have their expanded value.

This is not a problem with -defaults, as the eclipse plugin is not aware of 
this value.



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