Add a verbose flag

[Xasmedy]

Add a verbose flag that when provided, would make bld print everything that it's doing under the hood, example:
Found source file x.java in path0
Compiling source x.java into path1
Plus other information that could be useful during debugging.

This would allow to have a better understanding of what's happening, helping to catch eventual bugs or bad configurations easily.
All the verbose messages can be printed onto stdout, or stderr if it's something not meant for normal execution.