Moved&renamed functions + BMNLogger

I moved all BMNative-related functions to a separate package, and I reordered and renamed the functions in them a bit.
So double-check your code for compilation errors after you update!

I have also added a logger for BMNative addons!
Now you can finally neatly log stuff on all platforms :)

Modified the readme a lot, and more documentation changes and updates.

Full Changelog: v4.1...v4.2