Include Chainstate in checking Transaction validity

check if one account from the chainstate has enough balance available that should be spend in the transaction, if the balance minus the available balance is below 0 the transaction should be considered invalid
check validity when mining considering the transactions to be added to the new block, to do so use a temporary clone of the chainstate when checking each transaction and add each transaction there. The issue could be that there are more transactions originating from one account inside a block to be mined that when added up exceed the accounts balance, in this case the first transactions not exceeding the balance are considered valid, the others invalid.

[GH-#10] - Included Chainstate in checking Transaction validity

[GH-#10] fixed broken test

[GH-#10] refactored filter invalid transactions function

[GH-#10] validate chainstate for block

[GH-#10] Small fix

[GH-#10] Added tx sign by priv key and tests

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