SLD format rewrite. Adds a versioned parser with read and write support. This does not come with full support for ogc:expression parsing, but makes for easy future enhancements. r=ahocevar (closes #1458)
git-svn-id: http://svn.openlayers.org/trunk/openlayers@6645 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
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