Added more verbosity levels
Fix handling of --verbose=... and BC break
Fixed tests
Removed unused options
Revert invalid changes
[Console] Handle new verbosity levels
[Console] Add tests and support for more types of inputs
Add notes in UPGRADE and CHANGELOG
Fix tests
merged branch Seldaek/verbosityflags (PR #7841)

This PR was merged into the master branch.

Discussion
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[Console] Add more verbosity levels

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6066
| License       | MIT
| Doc PR        | symfony/symfony-docs#2554

This adds new verbosity levels.

Replaces #7626 /cc @dlsniper

Commits
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02c2038 Fix tests
5327ec4 Add notes in UPGRADE and CHANGELOG
77c9791 [Console] Add tests and support for more types of inputs
54c1377 [Console] Handle new verbosity levels
e639686 Revert invalid changes
8f4d376 Removed unused options
5bb4163 Fixed tests
b62d35f Fix handling of --verbose=... and BC break
16cdb61 Added more verbosity levels