Add support of id-base attribute to extension xml files
|Reported by:||Nicklas Nordborg||Owned by:||Nicklas Nordborg|
It would be practical to be able to define a top-level 'id-base' attribute in extension XML file. This 'id-base' attribute would then be combined with the 'id' attribute of <extension id="..."> and <extension-point id="..."> tags to form the full id. This would save a lot of typing and avoid spelling errors since the common base shared among all extensions are defined only once.