TRS32 Version 1.21

* Added sound to the Stringy Floppy emulation (suggested by Terry Stewart, who also contributed the sound sample)
* Improved the sound used by the floppy disk emulation
* Fixed a problem with returning Stringy Floppy status (thanks to Terry Stewart)
* Changed the floppy autostart order to favor the Model I (suggested by Ira Goldklang)
* Fixed emulated floppy disk sector not found behavior (thanks to Ira Goldklang)
* Added copy and paste features (suggested by Ira Goldklang)
* Corrected behavior of an emulated Model I without lowercase