fixes conventionalDMR plugin support

[ellery]

This PR fixes plugin support for conventionalDMR. please see the following discord discussion for background.

This PR changes the following:

• Adds the use_streaming variable to dmr_recorder_impl.cc following the pattern from analog_recorder.cc.
• Adds a connect() between framer and the plugin sink
• Changes the variables passed to plugman_audio_callback

Tests conducted and open questions:

• I have built and tested this code on Ubuntu 22.04
• I have confirmed the basic functions of simpleStreaming on a single channel conventionalDMR system.
• I do not know how this will function with more then one talkgroup.
• Do we need a plugin sink for each slot?, yes it appears so.

The following configuration was used for testing:

{
        "ver":2,
	"audioStreaming": true,
        "sources":[
                {
                        "center":155000000.0,
                        "rate":3600000,
                        "gain":50,
                        "digitalRecorders":2,
                        "driver":"osmosdr"
                }
        ],
        "systems":[
                {
                        "channels": [155070000],
                        "type": "conventionalDMR",
                        "squelch": -70,
                        "shortName":"trbo",
            		"callLog": true,
            		"audioArchive": true
                }
	],
	"plugins":[
	   {
          "name":"simplestream",
          "library":"libsimplestream.so",
          "streams":[
            {
              "TGID": 0,
              "address":"127.0.0.1",
              "port": 55123,
              "sendTGID":false,
              "shortName":"trbo"
             }
           ]
	  }
	],
        "frequencyFormat":"mhz",
        "logLevel":"debug",
        "logFile":true,
        "defaultMode": "digital"
}

Thanks to @robotastic for pointing me in the right direction.

[robotastic]

Nice work! This looks good. The Main branch is sort of jacked up right now.... once I get things stable, I will merge this in