Script now defines a minimal Android API version when %anNdkApiLevel% is set to empty value
as 16 for 32-bit targets and 21 for 64-bit targets.
Added clearing of destination folders.
Added better handling of errors.
Added script adm/scripts/android_build.bat and template android_custom.bat.template
intended for automating building routines targeting Android platform.
OpenCASCADEConfig.cmake has been extended to detect "$INSTALL_DIR/libs/$CMAKE_ANDROID_ARCH_ABI/cmake/opencascade" location.