allow log level setting to appear anywhere

[andy-berry-dev]

At the moment, the global flags --info, --debug, --pkg & --show-pkg all have to appear at the end of the command, but they should be able to appear at any point.

We should probably improve the way we do the parsing for the log level too

[andy-berry-dev]

Comment from @dchambers on #834 (comment)

Also, why is it --info and not --verbose?

[andy-berry-dev]

From @andreoid on #1357:

In our mutli-module gradle build files, I wanted to be able to change the top-level default brjs command to be "brjs --debug" rather than just "brjs".

But this is not possible as brjs --debug says
"No such command --debug"
e.g.

brjs --debug build-app fxtrader

If the debug comes at the end, it works

brjs build-app fxtrader --debug

But I need to be able to set it at the start, as in my top-level gradle build file, I want all my subprojects to inherit the method to execute brjs and to all have common flags.

(The problem affects the --info flag too, and quite possibly other flags also)