fix comment for Error

rename ZeroMap -> MakeMapOf

add NewError

add BoolKeyMap and BoolElementMap

add MakeSliceWithMinCap

add ReverseByteSeq and ReverseBytes

rename: Zero -> ZeroOf, ZeroIt -> Zero

add MakeSlice, CollectMapKeys and AppendMapKeys

fix WriteStringWithBuffer

imporve WriteStringWithBuffer and write tests for it

merge IsTypeOf and AssertInto to TypeAssert