Add parameter definitions in dashboards that can be referenced in reports

[#1]

Currently, reports have filters defined that are usually fixed values such as project ID or project name. Then a dashboard is created to aggregate these reports for the same project ID/name.

Instead of having to pre-define the project or whatever filter criteria per report, it would be helpful to have key/value parameter(s) defined at the dashboard that can be referenced in reports using some syntax like @@parametername. This way, I can create 1 dashboard for 1 project ID, and all of my specific reports can configure the filter to look for project ID using that dashboard key. Then I do not have to create new copies of every report for a new future projects.