x3270 3.3.15ga8

Closes #35274.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
x3270: update 3.3.15ga8 bottle.
Adding vAVRdiasm v3.1
Switching to tarball
Removing formula
Use doublequotes everywhere
Adding vavrdiasm test
Fixing indentation
vavrdiasm: add 3.1 bottle.