XrefDrawingOrder

Purpose: Provides a DCL dialog to reorder XREF draw order from Top to Bottom, then applies that order safely using the DRAWORDER command.
Persistence: Remembers the last applied order per drawing and supports named saved orders stored on disk.

• Builds a temporary DCL dialog titled Arrange XREFs (Top → Bottom) showing the current XREF list and controls to reorder it.
• Uses the ordered list to apply draw order changes so each XREF is moved under the one above it, producing the requested Top to Bottom stacking.
• Stores the most recently applied order inside the current drawing using the Named Objects Dictionary so it can be recalled with Last.
• Supports disk-based Saved Orders with Save, Load, Rename, Delete, and Clear All operations.
• Rename behavior: pick an existing saved order in the dropdown, type a new name, click Rename. If the target name already exists, it is overwritten.

• String helpers: MXR:ToString, MXR:EnsureStr, MXR:Trim, MXR:JoinS, MXR:Split, MXR:Atoi.
• List helpers: MXR:Len, MXR:Nth, MXR:Reverse, MXR:Append1, MXR:InList?, MXR:IndexOf, MXR:ListRemoveAt, MXR:ListInsertAt.
• XREF helpers: AT:GetXrefNames, MXR:SSXref, MXR:MoveUnder, AT:Dedupe-Then-Fill.
• Per drawing memory: MXR:GetOrdersDict, MXR:SaveLastOrder, MXR:LoadLastOrder.
• Saved orders on disk: MXR:StorePath, MXR:LoadSaved, MXR:SaveSaved, MXR:DelSaved, MXR:FindSavedByName.

• List XREFs: Reads all XREF block definitions (excluding layouts) and displays their names in a list box.
• Reorder UI: Up, Down, Top, Bottom buttons reorder the list selection.
• Reset: Rebuilds the order from the current XREF set (deduped, then fills missing).
• Last: Restores the most recently applied order stored inside the drawing, then fills any new XREFs not in the stored list.
• Apply safe loop: Apply runs without closing the dialog, letting the user test and adjust repeatedly.
• Save named order: Saves the current ordering under a name, overwriting an existing record with the same name.
• Load named order: Loads a saved ordering, then merges it with the current XREF set (dedupe then fill).
• Rename: Renames the selected saved order to the typed name and overwrites the target name if it exists.
• Delete: Deletes the selected or typed saved order name if it exists.
• Clear All: Removes all saved orders from the storage file.
• Draw order application: Applies order by repeatedly issuing DRAWORDER to move each subsequent XREF under the previous one.

Clicking Apply executes the draw order changes immediately, saves the order as the per drawing last order, and keeps the dialog open.
• Clicking OK applies the order, saves it as last, closes the dialog, and returns the final list.
• Clicking Cancel closes the dialog without applying.
• The last applied order is stored inside the drawing under a dictionary entry named MXR_ORDERS with an XRECORD key _LAST_.
• Named saved orders are stored in a text file at MXR_XrefOrders.txt (typically under DWGPREFIX, otherwise USERPROFILE, TEMP, or current folder).

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