Fix for CFPropertyList error, closes #389 also stuck command fix for #143

V 2.2.0 of CFPropertyList would crash Siriproxy after the mic button was pressed, this forces it to use version 2.1.2.

Fixes InvalidByteSequenceError and closes https://github.com/plamoni/SiriProxy/issues/389

Second part fixed #143 with fix found by @Raggyx