Tidy Layout as signal flow; fixed-size wiresheet; signed Sox int writes

- Tidy Layout lays linked boxes out left to right by signal flow, in as few
  columns as the longest chain allows; feedback loops are cut where they run
  backwards, and sources sit just before the boxes they feed.
- Boxes with no link on the open sheet go to the bottom of the first column,
  alphabetically.
- A box that wires skipping its column would cross is pushed down below them.
- The wiresheet is fixed at meta's 255-step reach; outside it is light grey.
  Dragging keeps a box's top-left corner on the sheet.
- Sox write_i4 wraps to signed, so meta with x >= 128 reaches the device.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.173"
+VERSION = "0.0.0.174"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True