Version v0.7.1

updated changelog for v0.7.0b4, updated aw-watcher-web

updated aw-qt submodule with critical bugfix

updated submodules in preparation for v0.7.0b2

Merge pull request ActivityWatch#67 from ActivityWatch/dev/server-next

Major server refactoring

allow the macOS build to fail (issue ActivityWatch#27)

Updated webui to work properly in testing, updated to aw-watcher-afk …

…with less bugs

Updated submodules, added installation of nose for macOS build

Updated aw-core and aw-server

Hopefully fixed PyQt5 install