Added 'Test Run' build option

* 'Test Run' builds the game to a temp file, letting you run the story
without having to have saved it to a specific filename first.
* Moved the build options out of the Story menu into a Build menu.
* Fixed a bug that occurred when StoryIncludes included older .tws
files.
Added 'Test Run From Here' option

This option creates a temp test build and uses the selected passage as
the start passage. This permits expedient testing of deep parts of the
story. This option is available in the Build menu and also in the
passage right-click menu.