#1642: improved help #404: fix loghandling npe

[hohwille]

This PR fixes #1642

Implemented changes:

• improve help output #1642 improved help output
• enhance logging concept #404 fixed NPE from PR #404: #1713: advanced logging #1714 that prevented CLI errors to be printed/logged
• prevent help output on invalid CLI usage that was rather causing SPAM than being helpful, replaced with help hint.

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal

[coveralls]

Pull Request Test Coverage Report for Build 23022412641

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 140 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.07%) to 70.411%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/tool/ide/IdeToolCommandlet.java	1	78.33%
com/devonfw/tools/ide/commandlet/HelpCommandlet.java	12	85.79%
com/devonfw/tools/ide/context/AbstractIdeContext.java	127	65.85%

Totals
Change from base Build 23013411057:	-0.07%
Covered Lines:	10730
Relevant Lines:	14643

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💛 - Coveralls