refactored item module → stock, added legacy database creation methods

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

settings.gradle.kts

@@ -8,11 +8,11 @@ include("core")
 include("documents")
 include("files")
 include("legacy")
-include("items")
 include("messages")
 include("markdown")
 include("notes")
 include("project")
+include("stock")
 include("tags")
 include("task")
 include("time")