Experiment: New Maven4 transfer logging

[cstamas]

Example of rough sketch (actual loggers are not fully done yet) for mvn4 logging:

Supports:

• quiet (as before)
• classic (as Maven3 did always log)
• classic_light (as Maven3 but only "Downloaded..." lines)
• summary

Examples (building maven-resolver-ant-tasks always with empty local repo):

• classic (2459 logged lines): https://gist.github.com/cstamas/67770cb5da1d36dc48128a3529b52905
• classic_light (1575 logged lines): https://gist.github.com/cstamas/7ff6c5c4a99c6ea4f3e3a955795c9a92
• summary (697 logged lines): https://gist.github.com/cstamas/c40d50b2f4f952f4eb7a519867756f78

"Tricks" like those mentioned by @gnodet are NOT implemented, but would be cool to have them (progress with deleted lines), as currently summary "looks strange" (is silent but has strange pauses -- while downloads silently)

[mbien]

I like this one which sounds like a good compromise. I have the suspicion that some of the complaints might come from users which use maven without a fully featured terminal which would allow in-place updates (e.g in CI).

The classic mode would print every dl progress update into a new line which is not optimal. This is not a unique problem to maven, git does the exacts same last time I checked.