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/eu.msg

@@ -1,47 +0,0 @@
-# created by tools/loadICU.tcl -- do not edit
-namespace eval ::tcl::clock {
-    ::msgcat::mcset eu DAYS_OF_WEEK_ABBREV [list \
-        "igandea"\
-        "astelehena"\
-        "asteartea"\
-        "asteazkena"\
-        "osteguna"\
-        "ostirala"\
-        "larunbata"]
-    ::msgcat::mcset eu DAYS_OF_WEEK_FULL [list \
-        "igandea"\
-        "astelehena"\
-        "asteartea"\
-        "asteazkena"\
-        "osteguna"\
-        "ostirala"\
-        "larunbata"]
-    ::msgcat::mcset eu MONTHS_ABBREV [list \
-        "urt"\
-        "ots"\
-        "mar"\
-        "api"\
-        "mai"\
-        "eka"\
-        "uzt"\
-        "abu"\
-        "ira"\
-        "urr"\
-        "aza"\
-        "abe"\
-        ""]
-    ::msgcat::mcset eu MONTHS_FULL [list \
-        "urtarrila"\
-        "otsaila"\
-        "martxoa"\
-        "apirila"\
-        "maiatza"\
-        "ekaina"\
-        "uztaila"\
-        "abuztua"\
-        "iraila"\
-        "urria"\
-        "azaroa"\
-        "abendua"\
-        ""]
-}