[*] Some fixes in ledger

[*] Some reneames as usual
[-] Call of UTXO load

added dap_ledger_t

group

master -> feature2272

[+] added dap_chain_node_addr_t in common

Feature 2272

master to feature-2272

[+] chain_id field for tx_token. Now its universal and could be used not only for emission but for shard<->shard ledgers connections

master->feature2272

[*] Renames datum macros and node roles

[-] token ops declarations

[*] hash->hash_slow renames

master->feature2272

[*] dap_chain_atom_t -> dap_chain_atom_ptr_t

[*] File load/save operations
[*] Some general functions for datums
[*] Mostly complete topmost abstractions for blockchain manipulations

Feature 2272

Merge branch 'feature-2272' of https://github.com/kelvinblockchain/libdap-chain.git into feature-2272

[*] Fixed const* issues

[*] Complete UTXO API with tokens, tokens emissions and tx token.
[*] Fixed calc ballance
[*] dap_chain_addr changed is internal structure a little, same with related macro defines
[*] Others renames and refactors

bring to master