Rename .unitelabs directory to .sila

Niklas Mertschrequested to merge
NMertsch-master-patch-05404 into master

When using a SiLA Server with support for SiLA Binary Transfer, a directory .unitelabs will be created in the home directory.

This library is not a UniteLabs product, but a open-source implementation of SiLA 2, developed by many parties (including UniteLabs). To reflect this, I propose to rename the directory to .sila.

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