[telepathy-qt] Convert to a subtree.
Squashed 'telepathy-qt/' content from commit 939a14b

git-subtree-dir: telepathy-qt
git-subtree-split: 939a14b3878eaed64cb0d757de3cea5b67d5ddec
Merge commit '13d7df869d6d17a6e53fcd0d1e0cf17eed579076' as 'telepathy-qt'
[telepathy-qt] Do setup steps at the beginning of build.

This makes the package buildable with mb, which skips %setup.
[telepathy-qt] Install tests.
[telepathy-qt] Patch to build with Qt 5.

Originally sourced from Ubuntu.
[telepathy-qt] Remove Qt 4 packaging.

No sense in maintaining the old packaging, we no longer use it in Nemo.
[telepathy-qt] Remove patches from packaging.

Not needed now we are using a subtree.