Recursive variables

[alexandrehtrb]

A value could reference another variable, like:

Key	Value
FirstName	John
LastName	McClane
FullName	{{ FirstName }} {{ LastName }}

FullName should output John McClane

Method to change

https://github.com/alexandrehtrb/Pororoca/blob/a61920148b5ebedeb920ddcada177121205278d3/src/Pororoca.Domain/Features/VariableResolution/IPororocaVariableResolver.cs#L50

and unit tests

https://github.com/alexandrehtrb/Pororoca/blob/a61920148b5ebedeb920ddcada177121205278d3/tests/Pororoca.Domain.Tests/Features/VariableResolution/IPororocaVariableResolverTests.cs#L7