boilerplate: new tool displaying list of variables

For a simplier use of go2pins, a new user tool has been created in order
to help.
For now it can display list of variable names.

* boilerplate/Makefile,
  boilerplate/main.go: Here.
1 job for hm/asttrans in 1 minute (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #73258
debian-stable-gcc

00:01:00