message: Add standard math envs to the default list
  Related to
diff: "subequations*": {
  "name": "subequations*"
  },
  + "multline": {
  + "name": "multline"
  + },
  + "multline*": {
  + "name": "multline*"
  + },
  + "gather": {
  + "name": "gather"
  + },
  + "gather*": {
  + "name": "gather*"
  + },
  + "gathered": {
  + "name": "gathered"
  + },
  + "align": {
  + "name": "align"
  + },
  + "align*": {
  + "name": "align*"
  + },
  + "aligned": {
  + "name": "aligned"
  + },
  + "alignedat": {
  + "name": "alignedat"
  + },
  + "flalign": {
  + "name": "flalign"
  + },
  + "flalign*": {
  + "name": "flalign*"
  + },
  + "xalignat": {
  + "name": "xalignat"
  + },
  + "xalignat*": {
  + "name": "xalignat*"
  + },
  "matrix": {
  "name": "matrix"
  },
  