Add project to PSCID generation

[ridz1208]

Brief summary of changes

Added option to generate PSCIDs using the project alias instead of the site alias. this is needed by several projects where permissions will be more project oriented then site.

to test:

• in your config.xml change between static, siteAbbrev and projectAbbrev make sure the correct PSCID gets generated

[johnsaigle]

It might be nice to change this signature to actually pass a Project object instead of an ID here, if possible. We'd benefit from built-in validation this way.

Up to you though - I'm not sure how complicated this would be.

[johnsaigle]

Consider changing this to $prefix and only using one variable since the validation for $projAbbrev and $siteAbbrev do the same thing anyway.

This also allows calling code for project abbreviations to be Utility::structureToPCRE(array, ?string) instead of Utility::structureToPCRE(array, ?string, ?string) meaning that it doesn't need to always use null for the second argument.

[ridz1208]

@johnsaigle I'd like to keep both finally. I would like to be able to one day generate Ids with more than one prefix.

I know it's not the case right now but I think users should be able to generate PROJ-SITE-0000 IDs and that would not be possible with passing around a single prefix value.

[ridz1208]

Documentation will be done in a different PR to avoid another rebase