Options Menu Update & bug fixes

Hey! Small update alert!

- Added an options menu with:

• music levels (0%, 25%, 50%, 75%, 100%)
• sfx levels (0%, 25%, 50%, 75%, 100%)
• Camera Shake On/Off (probably the most requested)

-Added a "Range" stat to the guns (Short, Medium, Long)

- Added A start screen (this was to properly load volume levels)

-Various text Corrections 

- Bugs

• + Ammo gemstone wasn't increasing max ammo, only giving +6 at the start of the fight. This has been corrected.
• XP was randomly resetting due to clicking on the score multiplier (when faded). This has been corrected and may have impacted the leaderboard slightly, will reset the leaderboard
• Hero/Gun sprites were floating and scaling in size when paused or on upgrade screen. This has been fixed.