Inline XML plain string resource references

[DevNatan]

Closes #17

This code should work now

<string name="avocado">Avocado</string>
<string name="nikocado">Nikocado @string/avocado</string>

Before	After
val avocado: String = "Avocado", val nikocado: String = "Nikocado @string/avocado"	val avocado: String = "Avocado", val nikocado: String = "Nikocado Avocado"

Note that this PR only resolves the plain string resource references, is planned that in the near future references to non-plain string references must be supported in a natural way like adding a quantity to the node when it references a plural.