g_thread_create() -> g_thread_new()

Switched use of deprecteated g_thread_create() to g_thread_new()
Now require glib >= 2.32
Removing call to gthread_init()

This is no longer required as we are requiring glib version 2.32+ now
now require vte >= 0.28 and gtk >= 2.24
removing unused function
bumping version to 0.16.3