Utility gets confused when unexpected packets are returned on MIDI bus

I ran into two issues with my E-my ESi-32 on firmware 2.10, both which seem to confuse the utility and break sending of samples. Of course the problem lies with the hardware unit, but it can be solved in software.

The issues that I observed are:
- When initiating a MIDI Sample Dump, it sends a Time Signature packet that confuses the utility. The length of this Time Signature packet is variable, yet always larger than SDS_RESPONSE_LENGTH, so that breaks the utility's logic.
- The unit sends corrupted SysEx packets (I observe multiple Start-Of-SysEx bytes, like `F0...F0...F7`). This issue can be mitigated by dropped what was read so far upon detecting a new `F0` (SOX) while waiting for an `F0` (EOX)

Start by locating SDS_RESPONSE_LENGTH and the MIDI SysEx receive/parsing loop in the utility. Reproduce the E-mu ESi-32 responses described in the issue, then verify that unexpected Time Signature packets and a new F0 while waiting for F7 no longer disrupt sample sending.

Written by the indexing model from the issue text.