Preparing for 6.0.0 release

[paulpv]

• Tweak libndi-get.sh
• Tweak CMakeLists.txt
• Tweak readme
• Bump OBS-NDI version to 6.0.0
• Rebrand from Stéphane Lepin [email protected] to OBS-NDI Project [email protected]
• Add Discord link in app
• Major cleanup of strings
• Update to NDI SDK 6.0.1
• Update Config logic to match obs-websocket
• Add a --obs-ndi-verbose command-line option to print out 'a' and 'v' for audio and video packets respectively