Replace jpim.jar by ez-vcard.jar

With the suppression of all jar to download them form jcenter, the jpim.jar isn't present.

To resolve this issue we can convert the current use for import/export vcard by an other api ez-vcard (https://github.com/mangstadt/ez-vcard) under bsd licence and present on jcenter.

The refactoring raise some problem on existant code, we will try with Gil to improve the import/export to grow data conversion to functional framework.