In previous implementation IR worked with exactly 7 alphabetic contracts
only. Actually number of contracts is limited to only the Glagolitic
alphabet.
Make IR to work with any valid number of alphabetic contracts. Change parser
of alphabetic contract addresses to read amount of processing contracts
before performance. Make Alphabet processor to use interface of the
alphabetic contract group. Use `alphabetContracts` type in IR `Server`.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
There is no need to specify that IR indices are 32 bits in size.
Change return types of `Indexer` interface methods in audit and alphabet
packages. Support interface changes in `Server` implementation.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
