RFR: 4819: Improved tooltips and context menus for Stack Trace View

[Miroslav Wengner]

bug fix: https://bugs.openjdk.java.net/browse/JMC-4819 tooltips

I'd propose, if not created yet, to create a ticket according to the correct behaviour of Stacktrace when treeView is selected (enabled/disabled) and switching over branches with enabled/disabled "Layout Option -> Reduce Tree Depth". Also when the current setup us saved and JMC reopened.

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Commit messages:
 - 4819: tooltip text corrections,  Disable : "Reduce Tree Depth" when not tree view selected

Changes: https://git.openjdk.java.net/jmc/pull/140/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=140&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-4819
  Stats: 22 lines in 6 files changed: 9 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/jmc/pull/140.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/140/head:pull/140

PR: https://git.openjdk.java.net/jmc/pull/140