Patch 0.6 Beta release (GUI improvement)

Added:

New GUI.

Sprite preview.

Trajectory preview.

Better gravity calculation.

Main menu revamp.

Scrolling menu for the planets.

Preview for the mas sand radius of an object.

Revamped most scripts for better performance.

Fixes:

Placing planets under GUI elements.

Game crashes by too many rigid bodies (planets,moons ,ECT).

All the rigid bodies going to 0,0 in position,velocity and saying NAN(Not A Number).

Auto orbit not working sometimes .

Sun,Jupiter and ECT got there real masses .

Removed:

X velocity slider (also the setter).

Y velocity slider (also the setter).

Mass slider (also the setter).

Auto orbit still works but it's hidden.

Most unused Sprite2D,Meshs and much more.