Minifier mangles the texture2D keyword

[adamvleggett]

For WebGL 1 shaders, we still need texture2D, but it appears the mangler is renaming this keyword.

[arcman7]

For WGSL
It also:

• mangles variable names into reserved keywords such as "as"
• mangles "1e-6" into "1e -6" (same for 1e+6)
• possibly adds an extra comma to the last argument in a list of arguments to a function

But otherwise it works fine for me

[CodyJasonBennett]

I think that is largely fixed by re-implementing the minifier with the new AST (WGSL is still WIP there #20). It currently only uses the tokenizer and a few meticulously crafted heuristics for a mostly correct result, but not correct enough to be stable (basic whitespace collapse is fine though). WebGL1 is different since I need to add new keywords for minification but don't close the door for validation later.