Addon: cleanup, use relative imports where possible

addon/flamenco/comms.py

@@ -25,7 +25,7 @@ def flamenco_api_client(manager_url: str) -> _ApiClient:
 
     dependencies.preload_modules()
 
-    from flamenco import manager
+    from . import manager
 
     configuration = manager.Configuration(host=manager_url.rstrip("/"))
     _flamenco_client = manager.ApiClient(configuration)

addon/flamenco/dependencies.py

@@ -8,7 +8,7 @@ def preload_modules() -> None:
     if "dateutil" in sys.modules:
         return
 
-    from flamenco import wheels
+    from . import wheels
 
     wheels.load_wheel_global("six", "six")
     wheels.load_wheel_global("dateutil", "python_dateutil")

addon/flamenco/preferences.py

@@ -6,7 +6,7 @@ import bpy
 
 def discard_flamenco_client(prefs, context):
     """Discard any cached Flamenco client after the Manager URL changes."""
-    from flamenco import comms
+    from . import comms
 
     comms.discard_flamenco_data()