Datalog (#233)

* support for custom csv separator

* simple datalog frameowrk

* api strings

* hide setfile

* storage fixes

* log seconds, not milliseconds

libs/datalog/_locales/datalog-strings.json

@@ -0,0 +1,6 @@
+{
+  "datalog.addRow|block": "datalog add row",
+  "datalog.addValue|block": "datalog add %name|=%value",
+  "datalog|block": "datalog",
+  "{id:category}Datalog": "Datalog"
+}