RFR: 4819: Improved tooltips and context menus for Stack Trace View [v3]

[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.

Miroslav Wengner has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' of https://github.com/openjdk/jmc into bugfix/4819_Improved_tooltips_and_context_menus_for_StackTraceView
 - 4819: cleanup, uncessary code
 - 4819: tooltip text corrections,  Disable : "Reduce Tree Depth" when not tree view selected

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/140/files
  - new: https://git.openjdk.java.net/jmc/pull/140/files/dff28af4..a76dd592

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=140&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=140&range=01-02

  Stats: 984 lines in 27 files changed: 943 ins; 9 del; 32 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