Add to Environment the name of file in lowercase

From some time Google requires Android APK names be lowercased. When creating Android apps the one Custom Build Step is always needed - rename android-build-release-signed.apk to final distribution name. Sometimes it needs be automatically copied. But if application has names with uppercase characters - then it's name must be entered in lowercase manually.

Suggestion: add Envronment variable CurrentProject:FileNameLowcase which will contain same as CurrentProject:FileName but in lower case. After this process can be automated once for several different projects with (assuming this is in Linux):

Command: cp
Parameters: android-build-release-signed.apk /target/%{CurrentProject:FileNameLowcase}.companyname.com.apk
Working dir: %{CurrentProject:BuildPath}/android-build/build/outputs/apk