Horse & spider gen pos

[Rivmun]

https://github.com/Rivmun/FootprintParticle/blob/143bf98ee967012c3cc90cd068606bca91700f06/src/main/java/rimo/footprintparticle/mixin/LivingEntityMixin.java#L63

Something was wrong and listed here.

• [x] Print cannot gen for horse & spider when their rotation in some special value. (Fix in #25 )
• [x] Print for horse will gen in wrong place when horse facing along X-axis (or Z? I didn't confirm that.) (Fix in #30 )
  • Detailized, the print gen on left-right instead of front-behind.

[Rivmun]

About entity rotation: https://github.com/Rivmun/FootprintParticle/blob/b00460e1f048010414acda1756e5bcc25958fa5a/src/main/java/rimo/footprintparticle/mixin/LivingEntityMixin.java#L37 It's should be (((getX() || getZ()) && isOnGround()) || ...)

[Rivmun]

Note: When convert the entity.getRotationClient().y (express as entity's yaw) to a directional vec3d or vec3f, should be:

vec3d.x = -sin(rotationClient.y)
vec3d.z =  cos(rotationClient.y)

Remember the minus at x component.

The 2 task in this issue is a same point of the yaw conversion matter.