Add string pdf builder

Add multi page support

Start implementation on multi page text/table

Complete writing of text to table & plain text.

fix writing to file

fix text writing

Start fixing PDF building (multi lines)

Add test coverage + support text wrap on writeText(Ã)

Add test coverage

Start implementation / moving / cleaning up of the PdfBuilder (parent

Add comments to the PdfContext class

Add coverage for the context class

Add common VIAE logic (PojoBuilder and Tester)

Start implementing PDF context

Merge branch 'master' of https://github.com/VIAE-IT/PDF-template-engine