Implement all TS3 functions

[icedream]

TeamSpeak 3 passes a structure with callable functions to the plugin. All functions need to be wrapped in a way that is accessible to cgo.

All functions are listed in ts3_functions.h.

[icedream]

TS3 function wrapper generation has been added in 3551b83.

[icedream]

I added the first batch of functions with 47743c1 for creating/destroying server connection handles and logging to the TS3 log!