Extension:WikiHiero/JSesh migration

Incompatibilities

 * is treated by the old renderer like , however JSesh follows the standard and its output doesn't have the vertical bars on the sides.
 * is missing, approximated with . Doesn't seem to be present at least on enwiki though.
 * and   are missing. The latter can be approximated with   though.
 * The signs   look different.
 * is missing.
 * is missing, doesn't seem to be used though.
 * is wrong in the old renderer, JSesh's symbols are compliant with Unicode. V10A should be V11A, V11A should be V11B and V11C should be... present.