[+] Datum operations functions
[*] Consensus and class are splitted. Class is for feature usage.
[*] Added const* everywhere (almost)

[-] Removed cache init calls
[*] Splitted token byt tx_item_token, token itself and token_emission

Feature 2152

added creation of transfer transaction by addr and sum in cache
fixed errors in the  transaction cache
modify create items functions

Created the first transaction in the chain which includes token, in, out

and sign items.
Added auxiliary functions for working with transaction items

Feature 2152

modify structs for transaction items (dap_chain_tx_*)

update from master

[+] Added some headers

add datum items maniplation functoin

[*] Fixed some issues

[+] Datum now inherits from dap_chain_t
[*] Lot of small changes

[+] Hashlist of chains

Feature908