[8.0] Port the module 'account_move_template' to the new API

This PR contains the module ***account_move_template*** ported to the new API.
Test and installation seems to me ok.

Let's see what will be the TravisCI response and your reviews :wink: 
Thanks a lot @guewen, it works!!!
I was giving a glance at the ```safe_eval``` code and I was also close to the solution :wink: