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Previous hacks didn't fully work (the \left{ problem), and also added a \right} fix now

Hacked some problems with the \ character already being formatted on some websites. This way, when someone unfamiliar with these formatting problems tries to write LaTeX it still recognizes it most of the time. I hope this does not cause more bugs than it solves... Seems to work fine for me so far.

Added the option to automatically render when the page loads. Also added a double render so the user wouldn't need to click the button twice anymore (this is not obtrusive, as the render is nearly instant).

Just added a comment about the MathML part that I deleted in the last version.

Added configurable background and border for the rendered LaTeX.

Moved user defined input to the top and added color to indicate a rendered piece of LaTeX.

Replaced any \mbox with \textnormal since KaTeX did not seem to support mbox