Rename package from 'nw' to 'novelwriter' (#868)

* Rename nw folder to novelwriter
* Rename nw to novelwriter in auxiliary files
* Rename nw to novelwriter in main app source
* Rename nw to novelwriter in tests
* Make setup script for pdf docs less spammy

tests/test_base/test_base_config.py

@@ -28,8 +28,8 @@ from shutil import copyfile
 from mock import causeOSError, MockApp
 from tools import cmpFiles, writeFile
 
-from nw.config import Config
-from nw.constants import nwConst, nwFiles
+from novelwriter.config import Config
+from novelwriter.constants import nwConst, nwFiles
 
 
 @pytest.mark.base