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/pkgIndex.tcl

@@ -1,7 +0,0 @@
-if {![package vsatisfies [package provide Tcl] 8.6.0]} return
-if {($::tcl_platform(platform) eq "unix") && ([info exists ::env(DISPLAY)]
-	|| ([info exists ::argv] && ("-display" in $::argv)))} {
-    package ifneeded Tk 8.6.15 [list load [file join $dir .. .. bin libtk8.6.dll]]
-} else {
-    package ifneeded Tk 8.6.15 [list load [file join $dir .. .. bin tk86t.dll]]
-}