[Feature request] Different soul gauges for each difficulty

[0auBSQ]

Easy/Normal 60% Hard 70% Oni/Edit 80%

[0auBSQ]

About textures I might actually consider using the dan gauge ones (without the exam mark) to make it separate options for each difficulties with a slider, also using the same assets for the result screen

[0auBSQ]

Decided to take this feature in a different way (implemented on the latest commit) :

• Gauge pass line stays 80% for all difficulties (Which will not be settable, in case of a future online game mode)
• Easy, Normal and Hard gauges now fill and drop faster according to the following formulas :

  Easy : Value x1.6 (Similar to a 50% pass line gauge)
  Normal : Value x1.33 (Similar to a 60% pass line gauge)
  Hard : Value x1.14 (Similar to a 70% pass line gauge)

• Tower charts gauge gains are now completely disabled (Value x0), so the animations will not play where they shouldn't do so
• Gauges are harder to fill for 11 stars charts and more according to the following formulas :

  
  To fill completely the gauge without misses (On Extreme/Oni) : 

0-7 stars : 70.7% accuracy 8 stars : 70% accuracy 9/10 stars : 75% accuracy (Were the case for 11+ too until now) 11 stars : 78.5% accuracy 12 stars : 80.5% accuracy 13+ stars : 82% accuracy

Penalities for a miss/bad hit :

0-8 stars : Equivalent to 0.625x the fill value of a good hit 9/10 stars : Equivalent to 2x the fill value of a good hit (Were the case for 11+ too until now) 11 stars : Equivalent to 2.2x the fill value of a good hit 12 stars : Equivalent to 2.4x the fill value of a good hit 13+ stars : Equivalent to 2.6x the fill value of a good hit

The objective behind those choices is to make the game more equilibrated, making lower difficulty charts more lenient to clear (which is more welcoming for new players, since the values were based on the **Extreme** difficulty for every difficulties until now, as on TJAPlayer3) and very hard charts more challenging to pass, avoiding spam strategies for dense 11 stars and making the large medal gain for those levels more exigent to deserve and optain