Bump version to 0.93 and make it a "config" variable.

Author: dmitryleskov

build.bat

@@ -1,9 +1,11 @@
+@echo off
+set version=0.93
 if exist dist rmdir /s /q dist
 mkdir dist
 call src\utf8to16\build.bat
 "C:\Program Files (x86)\Pandoc\bin\pandoc.exe" -s -t plain -o dist\README.txt README.md
 "C:\Program Files (x86)\Pandoc\bin\pandoc.exe" -s --html5 -o dist\README.html README.md
 for %%i in (AddFLACs.bat AddFLACs.js COPYING.MIT COPYING.GPL bin\flac.exe bin\metaflac.exe) do copy %%i dist
 cd dist
-if exist ..\AddFLACs-0.92.zip del ..\AddFLACs-0.92.zip
-zip ..\AddFLACs-0.92.zip *
+if exist ..\AddFLACs-%version%.zip del ..\AddFLACs-%version%.zip
+zip ..\AddFLACs-%version%.zip *