add selectPlots output script

[orichters]

Purpose of this PR

• add a new output scripts that is a bit like compareScenarios2, but interactive.
• It is called via output.R -> comparison -> selectPlots.
• It allows the user to select line and area plots to be collected in a pdf file in output/plots.
• This allows to generate plots yet missing in compareScenarios, or with different bar plot years, or not create the whole 800 pages document if you just need a few plots
• The user can select regions, periods and bar plot years to be used. Another option is whether the difference to one of the scenarios should be plotted.
• For more details, see piamInterfaces::plotIntercomparison description.

Type of change

• New feature

Checklist:

• My code follows the coding etiquette
• I performed a self-review of my own code
• I explained my changes within the PR, particularly in hard-to-understand areas
• I checked that the in-code documentation is up-to-date
• I adjusted the reporting in remind2 where it was needed
• I adjusted forbiddenColumnNames in readCheckScenarioConfig.R in case the PR leads to deprecated switches
• All automated model tests pass (FAIL 0 in the output of make test): [ FAIL 0 | WARN 0 | SKIP 6 | PASS 90 ]
• The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Test runs are here:
• Comparison of results (what changes by this PR?):

[LaviniaBaumstark]

sonds like a nice feature, thanks!