fix wrong head rotations

[arse09]

Summary

• rename yaw/pitch to y_rot_deg/x_rot_deg to avoid confusions between units
• fix issues related to that, ie when camera was looking up, the server received the wrong x_rot (the head would go down)
• replace the raycast fn to fix the camera getting behind object. Partially fixed as sometimes it works and sometimes it doesn't
• add Position, Velocity and LookDirection wrappers that can be used for easier interfacing with glam and azalea

[Purdze]

is tick_water swim boost is inverted?

with 3rd person camera, old code checked 8 corners against is_opaque_full_cube

LivingEntity carries both look_dir.y_rot_deg and head_y_rot_deg.., split into head_dir + body_y_rot_target

x2 negation on head pitch: callers pass -info.head_x_rot_deg, then the anim fn does -head_x_rot_deg again

SubAssign for Position is inconsistent with Sub for Position: - returns a DVec3 delta which is good but -= stores the delta back as a position. probs better to drop or make it SubAssign

LookDirection::new clamps x_rot but doesn't normalize y_rot,move norm into constructor

was sens change to 0.15 intentional?

eye pos is hardcoded so leaving note here to change in future for sneak ect

partial_tick is bound twice in update_game