UI: Theme: Generalize geometry attribute properties

This PR generalizes properties for geometry (currently mesh only) attributes
found in 3D Viewport theme, namely:

- Combine "Edge Bevel" and "Vertex Bevel" into one "Bevel" property.
- Combine "Freestyle Edge Mark" and "Freestyle Face Mark" into one "Freestyle" property.
- Remove word "Edge" from Crease, Sharp, and Seam properties, to match others.
- Group all of the above together in the UI.

This is a breaking change (that will be handled with others in migration),
but doesn't introduce any visual changes in the default theme (and almost any theme).

Pull Request: https://projects.blender.org/blender/blender/pulls/146732

scripts/presets/interface_theme/Blender_Light.xml

@@ -487,21 +487,19 @@
         vertex="#000000"
         vertex_select="#ff7a00"
         vertex_size="3"
-        vertex_bevel="#00a5ff"
         vertex_unreferenced="#000000"
         edge_select="#ff9900"
         edge_mode_select="#ffd800"
-        edge_seam="#db2512"
-        edge_sharp="#00ffff"
-        edge_crease="#cc0099"
-        edge_bevel="#00a5ff"
-        freestyle_edge_mark="#7fff7f"
         face="#00000012"
         face_select="#ffa30033"
         face_mode_select="#ffb70033"
         facedot_size="4"
-        freestyle_face_mark="#7fff7f33"
         face_retopology="#50c8ff1e"
+        bevel="#00a5ff"
+        seam="#db2512"
+        sharp="#00ffff"
+        crease="#cc0099"
+        freestyle="#7fff7f33"
         face_back="#ff0000b3"
         face_front="#0000ff00"
         nurb_uline="#909000"