#138: added updater for mvn 4.x versions

[MattesMrzik]

Fixes #138. Maven updates for the 4.x releases are distributed via a different URL than the other releases, so this updater has been added to retrieve the 4.x releases from the new website. This may only be necessary temporarily, as these 4.x versions will later be listed on the original URL as well.

[coveralls]

Pull Request Test Coverage Report for Build 8758264712

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.04%) to 59.772%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/url/updater/UpdateManager.java	6	0.0%

Totals
Change from base Build 8757518371:	-0.04%
Covered Lines:	4587
Relevant Lines:	7389

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💛 - Coveralls

[aBega2000]

Except the one question I have asked, everything else seems fine and correct

[hohwille]

Note: Great work, looks all good, but we need to have devonfw/ide#1374 out in the wild as otherwise we are causing more harm than good.
So my suggestion would be to release the PR with devonfw-ide this month and then still wait ~1 month for it to spread out before we merge this PR and populate the maven 4.x-alpha versions.

[hohwille]

So my suggestion would be to release the PR with devonfw-ide this month and then still wait ~1 month for it to spread out before we merge this PR and populate the maven 4.x-alpha versions.

3 month later should be safe for merge.
If people are using outdated versions of devonfw-ide and therefore get maven updated to 4.*-alpha they need to run devon ide update scripts to prevent this undesired behavior.