Optimize build scripts

- rewrite the"exportDex" task group
- move  the logic of deleting temporary files into a gradle script
- fix "APPCENTER_KEY" property defining while debug building

scripts/build.bat

@@ -22,9 +22,6 @@ if "%ERRORLEVEL%" == "0" (
     echo %ESC%[31mFailed%ESC%[0m
     exit /B 1
 )
-del classes6.dex
-del classes7.dex
-del assets\version.properties
 
 echo.
 echo %ESC%[1;4mSign apk...%ESC%[0m

scripts/build.sh

@@ -33,8 +33,4 @@ cd ../scripts
 ./apksigner sign --ks debug.keystore --ks-key-alias androiddebugkey --ks-pass pass:android ../scripts/VTLite.apk
 check_result
 
-echo -e "${BOLD}VTosters Lite успешно собран! APK находится в папке scripts${NC}"
-
-cd ../smali
-rm classes6.dex
-rm classes7.dex
+echo -e "${BOLD}VTosters Lite успешно собран! APK находится в папке scripts${NC}"