Reorg tutorial code projects

Hey Rich,

I've reorganized the code project directories for our tutorials to match up with their article names. For instance, during the beginning of the tutorial creation process, we had many of our tutorial articles and code projects stored in `platform-frameworks` and `plat-fws`, respectively. Since then, the articles have been reorganized into different directories, but their corresponding code directories were not changed.

I've updated the code projects (for the tutorials that have example code) to match the reorganization of their matching articles. Thanks!