v0.6.0 - Ajout _internal pour fix erreur DLL

Changements :
- Ajout du dossier _internal/ (DLL Python generees par PyInstaller --onedir)
- Resout l'erreur "Failed to load Python DLL" : plus d'extraction dans %TEMP%
- build.bat copie automatiquement _internal/ a la racine apres chaque build
- _internal/ a re-committer uniquement si la version de Python change

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

_internal/_tk_data/images/README

@@ -0,0 +1,7 @@
+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.