runarberg / mathup / 6738109423 / 1

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Implement command tokens and handlers in parser

For now only font commands are commands, previously these were styles
and implemented along with other prefixes. Now commands will become
new binary prefix nodes in the AST which can apply special commands on
the nodes below. For fonts this means to some text transforms or add style
attributes. In the future we might implement color #40 and align #39
with command tokens.

**Language Changes**

- Now you can stack some font commands to combine them. For example,
  if you want bold italic A you can write `bf it A`. Not all font
  commands stack though e.g. `fr bb` will not give you double-struck
  fraktur.

**Output Changes**

- With the exception of `mathvariant="normal"` we no longer use the
  `mathvariant` attribute. Instead we apply the relevant text
  transform directly and the unicode characters in the output (see #70).
- Text gets some font commands applied via CSS (see #78). Specifically
  this is `bf`, `it`, `sf` and `tt` on texts (e.g. `bf tt "text"`).
  The latter two change the font-family of the output. If you want
  control of sans-serif and monospace fonts in the output you can set
  the CSS custom properties `--mathup-font-family-sans-serif`
  and `--mathup-font-family-monospace` respectively.

**Breaking Changes**

- Font commands now only applies to the first item in a term,
  previously it was applied on the entire term (see #77). `bf A_(i j)`
  would previously also boldface the indices (i j), but now it only
  boldfaces the matrix A.
- Font commands will no longer unwrap fences around the operant. For
  example if you write `bf(A)` previously the parenteses would be
  stripped, and you would only end up with A. Now the parenteses are
  left as is.

Resolves: #70
Resolves: #77
Resolves: #78

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