Fixed string-loading issue.
Fixes for handling file dialog, filters, etc.
Changed the return value of dlg_file so we can use its RO flag.
Removed the additional _WP statusbar menu items (no longer needed with new RO handling.)
Tandy PSSJ sound driver moved into Tandy machine file.
Fixed the dev_branch devices to use the UNSTABLE flag.
Added Unstable Device warning message in device.c.
Moved the SIO files to a new sio/ folder.
Added the 'version.h'stuff, added Makefile rule to generate the Manifest file for Windows.
Re-worked the About dialog - it now includes more info.
Several cleanups and fixes here and there.
Updated (Windows) UI to properly handle resets and changes in Settings.
Updated to no longer scan for roms at startup.