Resolve script resource lazy
----------------------------

                 Key: SLING-1473
                 URL: https://issues.apache.org/jira/browse/SLING-1473
             Project: Sling
          Issue Type: Improvement
          Components: Scripting
    Affects Versions: Scripting Core 2.0.10
            Reporter: Carsten Ziegeler
            Assignee: Carsten Ziegeler
             Fix For: Scripting Core 2.0.12


The script implementations use the SlingScript.getScriptResource().getPath() as 
a unique key for the script. The script resource is resolved in the current 
user context. This results in unnecessary resolutions during script executions 
just to get the path of the script - especially with a jcr backed resource this 
is quiet expensive.
Therefore we should rather use a lazy resource implementation which directly 
responds to getResourcePath() for getScriptResource(). Only if other methods of 
the Resource interface are used, the resource should be resolved.
First test showed a hugh performance increase of a lot of scripts are used to 
render a single request.

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