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/_tcl_data/msgs/mt.msg

@@ -1,27 +0,0 @@
-# created by tools/loadICU.tcl -- do not edit
-namespace eval ::tcl::clock {
-    ::msgcat::mcset mt DAYS_OF_WEEK_ABBREV [list \
-        "\u0126ad"\
-        "Tne"\
-        "Tli"\
-        "Erb"\
-        "\u0126am"\
-        "\u0120im"]
-    ::msgcat::mcset mt MONTHS_ABBREV [list \
-        "Jan"\
-        "Fra"\
-        "Mar"\
-        "Apr"\
-        "Mej"\
-        "\u0120un"\
-        "Lul"\
-        "Awi"\
-        "Set"\
-        "Ott"\
-        "Nov"]
-    ::msgcat::mcset mt BCE "QK"
-    ::msgcat::mcset mt CE ""
-    ::msgcat::mcset mt DATE_FORMAT "%A, %e ta %B, %Y"
-    ::msgcat::mcset mt TIME_FORMAT_12 "%l:%M:%S %P"
-    ::msgcat::mcset mt DATE_TIME_FORMAT "%A, %e ta %B, %Y %l:%M:%S %P %z"
-}