Rewrote text alignment method to work with sprites

[NathanFlurry]

I rewrote the text alignment code to reposition the text in CanvasText instead of moving the sprite or mesh object itself. With the current method of text alignment, sprites appear to behave oddly when rotating. This is because sprites always pivot around the origin of the object, so moving the sprite's position itself based on the text size just moves the entire sprite and does not change the pivot point. However, by doing the text alignment in the canvas itself, the sprite's pivot point will remain the same and the text moves around the pivot point appropriately.

The only downside to using this method is that the canvas size will be about twice as big as required to render the text, since there needs to be a lot of empty space for left and right alignment.

[endel]

Hey @NathanFlurry,

Thanks for your pull-request. I really wouldn't like to increase the texture size even more though. :(

One major concern of using this library is performance. Each text you create with this library generates a new texture, which will increase your draw calls. It would be awesome to have a single texture in which all texts could share, having just one draw call. (#7) - and it would be better to have it as small as possible.

I'll ask you to kindly to remove the lib/*.js and lib/*.d.ts files. (sorry, the .gitignore should be taking care of this already)

I'll find some time to review during the weekend.
Thanks!

[NathanFlurry]

I fixed the .gitignore and added the option to choose the alignment. The MeshText2D defaults to child alignment (the old alignment) and the sprite defaults to texture alignment. This is configurable using TextOptions.alignmentMethod if the developer wants to switch.

Thanks!

[NathanFlurry]

@endel Did you get a chance to look at this PR? Thanks!

[endel]

closing this since #29 has made into master!