fix resource deps: generate more cleanly - no targets if there are no prereqs. no empty lines.
fix resource copy performance: remove debug
fix filters: behave if someone puts 2 identically named filters into the plugin dir by mistake.
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Description:
-->
<!ELEMENT featureuids (features,default)>
<!ELEMENT features (feature+)>
<!ELEMENT feature EMPTY>
<!ATTLIST feature
name CDATA #REQUIRED
uid CDATA #REQUIRED
installable (true|false) #IMPLIED>
<!ELEMENT default (range+)>
<!ELEMENT range EMPTY>
<!ATTLIST range
min CDATA #REQUIRED
max CDATA #REQUIRED
support (include|exclude) #REQUIRED>