Allow slides that are not orthogonal or diagonals

[Idonotus]

Should implement #11

Pieces can slide along lines that aren't diagonal. This implements fairy riders like the knightrider. All slides use organized lines to implement slides quickly

TODO:

• Generate legal slide lines
• Implement checkdetection
• Allow for line step multiples
• Optimize organized lines by tracking needed lines
• Max slide based on steps
• Highlightlines.js and long distance slide lines
• Horizontal and vertical highlight lines
• Arrows of distant sliders + fix arrows.js
• Rewrite highlight.js to render diagonals

Clean up

• Optimize arrows
• finetune highlighting
• Documentation

[Naviary2]

@Idonotus There's more complex stuff with this. Because there can be an organized line (2,0) that begins on square (0,0), and an organized line also (2,0) that begins on square (1,0). They both are (2,0), yet they are completely different and do not intersect. Because of this, the keys of the organized lines also need to specify their starting x or y intercept.

In mine and ScorpioneOrzione conversation from a while ago (scroll up to read it all), we came to the conclusion that keys would need to include the nearest (x,y) coordinate they start on after crossing, for example, the x axis. So basically, [dx,dy,x,y].

You may be able to use these, but Scorpione made these two desmos graphs that can, if I remember, take the coordinates of any piece, and auto calculate the nearest point that organized line intersects after the x/y axis!

https://www.desmos.com/calculator/d0uf1sqipn
https://www.desmos.com/calculator/t9wkt3kbfo

[Naviary2]

Maybe not needed anymore at this point, but is comparing the c value of the lines enough to tell if they are colinear? If c's are equal => colinear.

[Naviary2]

And these as well! Are they for arrows.js?

[Idonotus]

Is it alright if i delete this function?
From what I can see it has been replaced and doesn't work with all slopes

Replaced by