Tidy up popup layouts

- Settings: labels in one column and switches and number buttons lined
  up in another, with margins inside the panel
- Log: title and margins; text no longer touches the panel edge
- Sync result: error list centred under its header, which now reads
  Errors instead of CatchedErrors
- About: text wraps inside the panel instead of running under the
  scrollbar
- Character select: wider panel, so the right column of characters is
  no longer right next to the scrollbar

Log.tscn

@@ -20,17 +20,28 @@ unique_name_in_owner = true
 visibility_layer = 513
 custom_minimum_size = Vector2(700, 700)
 layout_mode = 0
-offset_right = 40.0
-offset_bottom = 40.0
+offset_right = 700.0
+offset_bottom = 700.0
+
+[node name="TitleLabel" type="Label" parent="LogPanel"]
+layout_mode = 0
+offset_top = 8.0
+offset_right = 700.0
+offset_bottom = 48.0
+theme_override_font_sizes/font_size = 25
+text = "Log"
+horizontal_alignment = 1
 
 [node name="LogScrollContainer" type="ScrollContainer" parent="LogPanel"]
-custom_minimum_size = Vector2(700, 700)
 layout_mode = 0
-offset_right = 40.0
-offset_bottom = 40.0
+offset_left = 20.0
+offset_top = 56.0
+offset_right = 680.0
+offset_bottom = 684.0
+horizontal_scroll_mode = 0
 
 [node name="LogVBoxContainer" type="VBoxContainer" parent="LogPanel/LogScrollContainer"]
 unique_name_in_owner = true
-custom_minimum_size = Vector2(700, 700)
 layout_mode = 2
+size_flags_horizontal = 3
 theme_override_constants/separation = 1