add support to monitor Crestron audio visual equipment

[jclark-spl]

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What is the sc4s version?

Is there a pcap available? If so, would you prefer to attach it to this issue or send it to Splunk support?

What the vendor name? Crestron

What's the product name?

If you're requesting support for a new vendor, do you have any preferences regarding the default index and sourcetype for their events?

Do you have syslog documentation or a manual for that device??

Feature Request description: App is created would like it to be supported https://splunkbase.splunk.com/app/4672

Do you want to have it for local usage or prepare a github PR?