Make the "Using library" output messages a bit more visible

[cmaglie]

I'm talking about the:

Using library Keyboard at version 1.0.0 in folder: ....
Using library Mouse at version 1.0.0 in folder: ....
Using library HID at version 1.0 in folder: ....

displayed when the verbose output is enabled.

Currently those messages appears in the middle of a bunch of gcc command lines, making them barely visible.

If it's not possible to put them at the beginning, maybe it's worth printing them at the end with a line of separation from the "bulk" of the build?

[PaulStoffregen]

These used to be at the very beginning, and the duplicate messages were at the very end, right before the size info.

[ffissore]

Both messages pushed to the bottom