8BitBoy 1.45 - Run forrest run!

This is maybe the most requested feature of 8BitBoy yet. Now it's finally added with much success. Hope you enjoy this new addition.

• Speed running, press ALT or X button to run
• New music in World 2, both indoor and outdoor
• New music in level selection / world map
• New music in World 4 (only inside)
• Tutorial after intro - learn the upwards shot and speed running!
• The Walking cactus can be woken with a shot
• Reduced waiting time before reloading game
• New dying animation
• Added water splash (+ lava and sand)
• A few new sound effects
• Boss world 1 - fixed wall bug
• Black crows "caws"
• Added power-up sounds
• Added grass to world 2