New tutorial, mechanics remake and more

Making a big change to the game, now i've scrapped the whole "press break to reduce max speed" mechanic that led people to cofusion.

# Added:

- New distance meter mechanic:

 Replacement for the removed break mechanic. now the player is considered to be "too slow" based on the distance between the player and the opponent.

- New visuals: 

A new ending screen along with some changes to the main menu and a whole new character and scenario for the tutorial.

-  Tutorial skip:

Added an option to skip the tutorial at the beggining.

- Repositioned pushback bar: 

The pushback bar now controls the hability to break as well and instead of being at the top of the screen now it is on top of the player character, making visualisation easier.

- New popups: 

There's changes to the popups in order to try to avoid eyeburn by the font color, the colors still the same but less brighter.