based on vcvrack v1.1.6 (fourth/rpi4 edition)

• cleanup: remove vcvrack v0.6.2c, padthv1 and synthv1 support
• cleanup: remove support for some systems which are simply to slow to run vcvrack
• add sfizz support for having the option of four sfz sample instrument based voices
• the default patch now has an audio interface as otherwise the cpu usage might get very high
• default to 32khz sample rate for jack too to lower cpu usage
• rpi4 uses the v4.19 linux kernel now as the newer ones do not seem to work properly with rpi4's with more than 1gb of ram
• some more minor fixes and improvements