A whole host of changes to start supporting more unified approach to uniqueness

Lots of refactoring still to be done in the codebase, and currently TRANSFER
method does not work - the daemon does not send the real output for some reason.
Lots still to do - please be patient.
This code is NOT ready for use. Or testing. Or anything else.

src/multisig/multisig.cpp

@@ -98,7 +98,9 @@ namespace multisig
     // - the 'multisig priv keys' here are those held by the local account
     // - later, we add in the components held by other participants
     cryptonote::keypair in_ephemeral;
-    crypto::hash uniqueness = crypto::cn_fast_hash(reinterpret_cast<void*>(&real_output_index), sizeof(size_t));
+    //crypto::hash uniqueness = crypto::cn_fast_hash(reinterpret_cast<void*>(&real_output_index), sizeof(size_t));
+    crypto::ec_scalar uniqueness;
+    assert(false);
     if (!cryptonote::generate_key_image_helper(keys, subaddresses, out_key, tx_public_key, additional_tx_public_keys, real_output_index, uniqueness, in_ephemeral, ki, keys.get_device()))
       return false;
     std::unordered_set<crypto::key_image> used;