made the pack completely portable and wrote relevent bat files to go with it

gitportable/mingw64/lib/tcl8.6/tzdata/Asia/Karachi

@@ -0,0 +1,16 @@
+# created by tools/tclZIC.tcl - do not edit
+
+set TZData(:Asia/Karachi) {
+    {-9223372036854775808 16092 0 LMT}
+    {-1988166492 19800 0 +0530}
+    {-862637400 23400 1 +0630}
+    {-764145000 19800 0 +0530}
+    {-576135000 18000 0 +05}
+    {38775600 18000 0 PKT}
+    {1018119600 21600 1 PKST}
+    {1033840800 18000 0 PKT}
+    {1212260400 21600 1 PKST}
+    {1225476000 18000 0 PKT}
+    {1239735600 21600 1 PKST}
+    {1257012000 18000 0 PKT}
+}