Customize the "Publishing" disclaimer message. Add support for multi line and links

[stevenwinship]

What this PR does / why we need it: Need to allow the setting :PublishDatasetDisclaimerText to be displayed with line feeds and embedded links

Which issue(s) this PR closes: IQSS/dataverse-pm#521

• Closes #

Special notes for your reviewer:

Suggestions on how to test this: use
for line feeds and <a href= for links. Maybe check for attacks/ embedded js code. This is an admin call so it shouldn't be an issue.

Example:
curl -sS -X PUT -d 'I agree to the following:
1. My submission has been fully anonymized (required for all humab subject'''s datasets).
2. My submission does not violate any known copyright laws.
3. I understand that I am liable for any and all violations of the Harvard Repository<a href="https://support.dataverse.harvard.edu/harvard-dataverse-general-terms-use">Terms of Use.' "http://localhost:8080/api/admin/settings/:PublishDatasetDisclaimerText"

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

Additional documentation:

[coveralls]

coverage: 24.873%. remained the same — 521-publishing-disclaimer-support-multiline-enbeded-links into develop

[scolapasta]

See comment about parsing - it's not necessary currently, but in case we change this, for example, to be set at the collection level, someday. (and yes, hopefully by then we'd've retired the JSF, so maybe just being extra careful / paranoid.

[stevenwinship]

Here is the setting update curl command

curl -sS -X PUT -d 'I agree to the following:<br/>1. My submission has been fully anonymized (required for all human subject'\''s datasets).<br/>2. My submission does not violate any known copyright laws.<br/>3. I understand that I am liable for any and all violations of the Harvard Repository <a href=https://support.dataverse.harvard.edu/harvard-dataverse-general-terms-use>Terms of Use.</a>' http://localhost:8080/api/admin/settings/:PublishDatasetDisclaimerText

[stevenwinship]

@scolapasta I added the MarkupChecker

[pdurbin]

I ran this:

curl -sS -X PUT -d 'I agree to the following:<br/>1. My submission has been fully anonymized (required for all human subject'\''s datasets).<br/>2. My submission does not violate any known copyright laws.<br/>3. I understand that I am liable for any and all violations of the Harvard Repository <a href=https://support.dataverse.harvard.edu/harvard-dataverse-general-terms-use>Terms of Use.</a>' http://localhost:8080/api/admin/settings/:PublishDatasetDisclaimerText

And it looks good! The link opens in a new tab, which is perfect.

Merging!