Added basic character movement

[henriiquecampos]

This adds all expected movements from a Megaman X based character which includes

• [x] walk (always on max speed, no acceleration)
• [x] jump (also Zero-like double jump)
• [x] dash (and air dash by default)
• [x] wall slide
• [x] wall jump
• [x] wall climp

I'd like to thank @MarianoGnu and @hyperdoxical from Godot Community for helping achieve this!

[MarianoGnu]

Remi's spirit talk's from the shadows: "Squash your commits"

[henriiquecampos]

The default merge method is Squash indeed :laughing: don't worry about that