SDK-15314 - fdb is outputting additional information on framework classes using the "info sources" switch
* We were outputting classes in the "flex" and "text" packages. Unfortuantely excluded classes are hard-coded in fdb, but I improved on the mechanism by putting excluded packages in a const array.
* Improved the detection mechanism to use actual package names as discovered by fdb rather than the path of the class. Previously, having "mx" at any level in the path would mark the file as a framework class and exclude it; now the package name must *begin* with "mx" (or "flex" or "text").
* Removed a defunct test for the file name being "frameworks.as".
NOTE: "text" is **temporary** until Vellum's package is finalized. I will file a separate bug to track this.
QA: Yes, please run the fdb suite.