Add ability to search all files in the project

Adds a "Find in Project" option to the "Project" menu and a "search" function to the ProjectManager.  Regular expression and multiline queries are supported.  Clicking a result will open the file (if not open already) and move the editor's cursor to the appropriate line and column.  I have plans to make this a combination "Find / Replace in Project".  Let me know if you have any questions.
Having `sanitizeQueries` run against the closure scope is kind of weird. I'd much prefer to make this an explicit function with inputs and a return value, and either run it directly against `findInProject.queries` (or, even better, feed it to `findInQueries.queries.map`.