Remove one unnecessary copy in csp_send_direct per call #27
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This change resolves the todo left in csp_send_direct for eliminating the need to
clone the packet if it will only be sent to a single interface. This is a net neutral
in terms of stack memory usage as it replaces the int used to detect a successful
send with a new interface pointer. If the user has chosen to use the RTable it
decreases stack memory usage by one int. This also eliminates bug prone copy
and paste by using MACROs for reuse of the subnet checks and sending logic.
This comes at a slight cost of increased instruction memory usage.