Coverage info not stay in same line

Changing the name of two test to make it short by one
character. I need change it because the awk script running
in Drone.IO demands all files in one line.
Implementing tests of belief class

This test depends on Functor class and Expression class.
Simple action test case
renaming method addActions to singular
Testing plan class
Changing to print nothing
Implementing grammar test interface

It's possible to use this interface to test
the correct and INCORRECT output of the main executable.
Fixing CI issues

Plan.cpp missing include
Expression wasn't erasing the internal data
Tests, Expression class do not hold the lexema pointer passed