In TeX display math mode \sum_a^b is rendered as
munderover, however \alpha_a^b is redndered as
msubsup.
This changes improves the heuristics to differentiate
between munderover operators such as sum prod and
other macros such as alpha, beta ...
Bug: T352697
Change-Id: I5a993e379791edeb3623171265e5be2651ee1359
* make intent annotations possible in TeX math items
* introduce a new command to annotate as well as node and translation
* Adds a parser expression grammar to validate intent attributes for
* it basically adds the previous, now abandoned changeset: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Math/+/949964
Bug: T327098
Change-Id: I21adfac4c3580e238f059721fdf0c1566cb4e857
* map to literals to corresponding unicode characters when a double-struck state is recognized
Bug: T352196
Change-Id: I9b9e1d87c10858789751cd14f23d2feea3b928dd
