Store project-specific settings in the preferences.

This stores project-specific settings, such as filesystem paths, for each
project, and restores those settings when the project is selected again.
Does not touch settings that haven't been set for the newly selected
project.

blender_cloud/flamenco/__init__.py

@@ -42,7 +42,7 @@ import bpy
 from bpy.types import AddonPreferences, Operator, WindowManager, Scene, PropertyGroup
 from bpy.props import StringProperty, EnumProperty, PointerProperty, BoolProperty, IntProperty
 
-from .. import async_loop, pillar
+from .. import async_loop, pillar, project_specific
 from ..utils import pyside_cache, redraw
 
 log = logging.getLogger(__name__)
@@ -67,7 +67,9 @@ class FlamencoManagerGroup(PropertyGroup):
     manager = EnumProperty(
         items=available_managers,
         name='Flamenco Manager',
-        description='Which Flamenco Manager to use for jobs')
+        description='Which Flamenco Manager to use for jobs',
+        update=project_specific.store,
+    )
 
     status = EnumProperty(
         items=[