[contrib/progress] allow hiding of inactive state

Add a new "hide-able" state "mayhide" that can be utilized by modules
without warning state. This state indicates that the module *may* be
hidden by autohide, if the user configures it like this.

see #835

bumblebee_status/core/output.py

@@ -229,7 +229,7 @@ class i3(object):
         for widget in module.widgets():
             if widget.module and self.__config.autohide(widget.module.name):
                 if not any(
-                    state in widget.state() for state in ["warning", "critical"]
+                    state in widget.state() for state in ["warning", "critical", "mayhide"]
                 ):
                     continue
             if module.hidden():

bumblebee_status/modules/contrib/progress.py

@@ -102,7 +102,7 @@ class Module(core.module.Module):
     def state(self, widget):
         if self.__active:
             return "copying"
-        return "pending"
+        return ["pending", "mayhide"]
 
 
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