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/af.msg

@@ -1,49 +0,0 @@
-# created by tools/loadICU.tcl -- do not edit
-namespace eval ::tcl::clock {
-    ::msgcat::mcset af DAYS_OF_WEEK_ABBREV [list \
-        "So"\
-        "Ma"\
-        "Di"\
-        "Wo"\
-        "Do"\
-        "Vr"\
-        "Sa"]
-    ::msgcat::mcset af DAYS_OF_WEEK_FULL [list \
-        "Sondag"\
-        "Maandag"\
-        "Dinsdag"\
-        "Woensdag"\
-        "Donderdag"\
-        "Vrydag"\
-        "Saterdag"]
-    ::msgcat::mcset af MONTHS_ABBREV [list \
-        "Jan"\
-        "Feb"\
-        "Mar"\
-        "Apr"\
-        "Mei"\
-        "Jun"\
-        "Jul"\
-        "Aug"\
-        "Sep"\
-        "Okt"\
-        "Nov"\
-        "Des"\
-        ""]
-    ::msgcat::mcset af MONTHS_FULL [list \
-        "Januarie"\
-        "Februarie"\
-        "Maart"\
-        "April"\
-        "Mei"\
-        "Junie"\
-        "Julie"\
-        "Augustus"\
-        "September"\
-        "Oktober"\
-        "November"\
-        "Desember"\
-        ""]
-    ::msgcat::mcset af AM "VM"
-    ::msgcat::mcset af PM "NM"
-}