Update for blender 5+ with retro-compatibility

- Added version check to keep addon compatible with previous version
- Some feature are still broken (e.g: realign, broken since 4.3's gpv3)
- note: DIR_PATH string property do not accept relative path since Blender 5.0.
preferences brush_path,output_path and playblast_path had "//" by default. those props are turned to stnadard string for now

utils.py

@@ -1485,6 +1485,30 @@ def has_fully_enabled_anim(o):
                     return False
     return True
 
+def get_fcurves(obj):
+    '''return f-curves of object's active action'''
+    if bpy.app.version >= (5, 0, 0):
+        # action slot
+        if obj.animation_data and obj.animation_data.action_slot:
+            active_slot = obj.animation_data.action_slot
+            return active_slot.id_data.layers[0].strips[0].channelbag(active_slot).fcurves
+    else:
+        if obj.animation_data and obj.animation_data.action:
+            return obj.animation_data.action.fcurves
+    return []
+
+def get_active_channelbag(obj):
+    '''return active channelbag in blender 5, else action'''
+    if bpy.app.version >= (5, 0, 0):
+        # action slot
+        if obj.animation_data and obj.animation_data.action_slot:
+            active_slot = obj.animation_data.action_slot
+            return active_slot.id_data.layers[0].strips[0].channelbag(active_slot)
+    else:
+        if obj.animation_data and obj.animation_data.action:
+            return obj.animation_data.action
+
+
 def anim_status(objects) -> tuple((str, str)):
     '''Return a tutple of icon string status in ('ALL_ON', 'MIXED', 'ALL_OFF', 'NONE')'''
     
@@ -1504,8 +1528,9 @@ def anim_status(objects) -> tuple((str, str)):
         #     off_count += 1
 
         ### Consider All channels individually
-        if o.animation_data and o.animation_data.action:
-            for grp in o.animation_data.action.groups:
+
+        if channelbag := get_active_channelbag(o):
+            for grp in channelbag.groups:
                 ## Check if groups are muted
                 if grp.mute:
                     off_count += 1
@@ -1514,7 +1539,7 @@ def anim_status(objects) -> tuple((str, str)):
                 count += 1
 
 
-            for fcu in o.animation_data.action.fcurves:
+            for fcu in channelbag.fcurves:
                 ## Check if fcurves are muted
                 if fcu.mute:
                     off_count += 1
@@ -1524,12 +1549,8 @@ def anim_status(objects) -> tuple((str, str)):
 
         if o.type in ('GREASEPENCIL', 'CAMERA'):
             datablock = o.data
-            if datablock.animation_data is None:
-                continue
-            if not datablock.animation_data.action:
-                continue
             ## Check if object data attributes fcurves are muted
-            for fcu in datablock.animation_data.action.fcurves:
+            for fcu in get_fcurves(datablock):
                 if fcu.mute:
                     off_count += 1
                 else: