Camp scens remind

[jmuessel]

Purpose of this PR

Add two additional demand scenarios for CAMPAIGners with different levels of lifestyle changes:

gdp_SSP2EU_CAMP_weak: low ambition lifestyle changes
gdp_SSP2EU_CAMP_strong: high ambition lifestyle changes

This PR corresponds with:
EDGET: pik-piam/edgeTransport#230
MRREMIND: pik-piam/mrremind#440

Type of change

(Make sure to delete from the Type-of-change list the items not relevant to your PR)

• 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)
• The changelog CHANGELOG.md has been updated correctly

Further information (optional):

• Calibration runs are here: /p/tmp/jaruschm/remind/output
• Comparison of results (what changes by this PR?):

[robinhasse]

Thanks Jarusch, looking good!