Merge the bug path list into the Report List tree

[dkrupp]

We do not need a separate window for the bug path list. Organize bug path list under report list similarly to how it is done in the CodeChecker web viewer.

[Locutus18]

I believe this has been partially done, please see https://github.com/Locutus18/CodeCheckerEclipsePlugin/tree/b8917e5437dd28800fd4dea9b2763a62a1ad2f01 and check it.

@dutow @gyorb @Xazax-hun

[dutow]

Yes, that looks like a good starting point for this.

Just a few ideas based on the diff of the latest commit:

• Handle getChildren() specially for ReportInfo instances: always return true instead of checking the size of children, thus returning immediately. Depending on the child array basically prefetches every bugpath.
• Implement partial tree refresh: currently the tree is totally reloaded (and closed) when we switch files. This is a highly annoying behavior if the bugpath is also in the same tree.
• At least rename displayBugPath to something different. It doesn't reflect it's functionality anymore
• I think displayBugPath also jumps to the source location of the problem

[Locutus18]

@dutow

• Handle getChildren() specially for ReportInfo instances: always return true instead of checking the size of children, thus returning immediately. Depending on the child array basically prefetches every bugpath.

Fixes

• Implement partial tree refresh: currently the tree is totally reloaded (and closed) when we switch files. This is a highly annoying behavior if the bugpath is also in the same tree.

Fixes

• At least rename displayBugPath to something different. It doesn't reflect it's functionality anymore. I think displayBugPath also jumps to the source location of the problem

Viewer 1.1 : delete method because not longer used.