ldirty, pdelay, ldelay added. changes to how levels are fetched

ldirty added, true iff level value has changed.

fetching level arrays moved to highest level of the app.

pdelay and ldelay added to _base_vals dataclass.

vmcompact/data.py

@@ -21,6 +21,10 @@ class BaseValues:
     using_theme: bool = False
     # bus assigned as current submix
     submixes: int = 0
+    # pdirty delay
+    pdelay: int = 50
+    # ldirty delay
+    ldelay: int = 50
 
 
 _base_vals = BaseValues()