The syntax highlighter inserts a semi-colon `;` after `<` and `>`

[FlatAssembler]

If you type this program:

if 2+2<5
  display "Correct!"
  display a
endif

And then press "Highlight Assembly", the syntax highlighter turns it into this program:

if 2+2<;5
  display "Correct!"
  display a
endif

Which is no longer a valid PicoBlaze Assembly program.

[FlatAssembler]

Here is what appears to be causing the problem:

PicoBlaze_Simulator_in_JS/headerScript.js

Line 146 in 9eb92c4

const assemblyCode = assemblyCodeDiv.innerText.replace(/&/g, "&")

But removing that, of course, causes more problems than it solves.

[FlatAssembler]

I've added an error message in case somebody tries to highlight a program containing <, > or &: 2390e42