Wish change priority to low during compile

[shb777]

When compiling programs that take more than one minute, I like to do other things with my computer, like browse, watch videos, etc. It's hard to do this because b4a is using all the cpu.
I think it would be good if the user had the option in the settings, of reducing the priority of b4a to below normal during the compilation, and then restoring it after it's finished compiling.