Blackbox using state vector

Blackboxed functions are now able to handle global variables, by using
G2PState as a reference.

 * main.go,
   tools/blackbox.go,
   transform/checktype.go, transform/global.go,
   transform/globaltostate.go, transform/localvariableassignments.go,
   transform/postglobal.go : Here.
1 job for hm/global in 2 minutes and 32 seconds
Status Job ID Name Coverage
  Test
passed #129588
debian-stable-gcc

00:02:32