Add non-transaction-chaining scheduler

processor/scheduler/utxo/standard/README.md

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+# UTXO Scheduler
+
+A scheduler of transactions for networks premised on the UTXO model.
+
+### Design
+
+The scheduler is designed to achieve fulfillment of all expected payments with
+an `O(1)` delay (regardless of prior scheduler state), `O(log n)` time, and
+`O(log(n) + n)` computational complexity.
+
+For the time/computational complexity, we use a tree to fulfill payments.
+This quickly gives us the ability to make as many outputs as necessary
+(regardless of per-transaction output limits) and only has the latency of
+including a chain of `O(log n)` transactions on-chain. The only computational
+overhead is in creating the transactions which are branches in the tree.
+Since we split off the root of the tree from a master output, the delay to start
+fulfillment is the delay for the master output to re-appear on-chain.