stream.resovler - added dependency on common.plugin.cache
stream.resolver - added @Cached decorator

@Cached decorator can be used on provider methods and enables caching
features (method result is cached for 24hours) provided by common.cache
plugin
migrated search history - now using common.cache sqlite storage backend instead of stupid file .. also enabled upgrade code for existing saved searches
rename @Cached to @cached
updated to stream.resolver 1.6.0
release stream.resolver 1.6.0