v0.6.2 - Retour en onefile, suppression _internal

Changements :
- Retour a --onefile : exe unique, plus besoin de _internal/
- Le fix Zone.Identifier (v0.5.9) resout le probleme de DLL pour les exe telecharges
- Suppression de _internal/ du repo et ajout au .gitignore
- build.bat simplifie

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

_internal/_tk_data/images/README

@@ -1,7 +0,0 @@
-README - images directory
-
-This directory includes images for the Tcl Logo and the Tcl Powered
-Logo.  Please feel free to use the Tcl Powered Logo on any of your
-products that employ the use of Tcl or Tk.  The Tcl logo may also be
-used to promote Tcl in your product documentation, web site or other
-places you so desire.