fixed naming FakeObjectDbTest -> FakeValueDbTest
redesigned errors reported by 'file' and 'files' smooth functions
removed dead classes
refactored out ReadXxx classes from ValueDb
refactored out STypes and ArrayType out of Type
refactored [Sandbox/ValueDb].xxxArrayBuilder() methods to generalized versions
renamed Value -> SValue, Type -> SType, ArrayValue -> SArrayValue
fixed .gitignore file
moved .lang.plugi.XxxBuilder -> .io.cache.value.build package
renamed AbstractValue -> CachedValue
moved CachedXxx to .io.cache.value.instance package
moved ReadXxx to .io.cache.value.read package