Feature/sprint-shoes-b-dash

[nolanlocke]

Implementing two things with this:

1. Adding -shoedash or --sprint_shoes_b_dash flag. When holding down B while the sprint shoes bit is enabled, it will cause the character to run at speed 5 ("Dashing")
2. Ported over SilentEnigma's Sliding Dash v1.1 fix: https://silentenigma.neocities.org/ff6/index.html

• When dashing right or down, it would freeze the character's animation. This fixes said bug.

KNOWN BUGS

• If dashing in Owzer's Mansion "Musical Doors" room during the door transition, the graphics on the screen become very corrupted and distorted.

[kielbasiago]

re-opened this in #37