Saviors update to 1.3 + trailer and screenshot update

Trailer and screenshots updated to better represent the outlook of the current version.

Update Notes:
- Game now correctly runs at 60 frames per second
- Vertical Sync enabled in fullscreen
- Continue button in main menu has a new description that describes the progress of the previous game.
- Some bullet patterns for the bosses in the later stages were made slightly easier. This was done to bring them down to better match the difficulty of the rest of the game.
- Co-op enabled for practice
- Changed difficulty descriptions to more accurately match the actual difficulty
- Multiplier drops slower in easy mode arcade
- Some perks changed and improved for Mona as they were slightly too weak.