Bulk-changes of dxp files

When you need to make a change in a dxp/analysis file - e.g. change a connection string to point to a new location, or fix a bug in a script - that's usually easy, but often, you want to make the same change in any affected dxp file (there might be thousands) in the Library, and there is currently no way to do that.

Idea: provide a streamlined solution to

1. search for/find specific content in dxp files (and optionally to output the results, e.g. to a log)

2. update the dxp files with new content, and overwrite them.

Parts of this functionality already exists, e.g. in the form of the find-analysis-scripts CLI command, Application Profiler and Automation Services, but a complete solution is needed.