WadSmoosh 1.0

- builds now have version numbers, let's call this 1.0
- added Theresa Chasar co-credit for E4M5, ATTACK.WAD and CANYON.WAD

- added map credit name lumps for Betray and Sewers (Xbox secret levels)
- full menu-based credits for all supported games thanks to Shockwave_S08
- small file size optimizations for PNG images
- better terminal output: announce wads found, episodes that will be in PK3, prompt for Y before continuing