Need new trained-data for Myanmar.

[nchanko]

The last committed trained data mya.trainnedata was about 9 years ago which has many errors and obsolete now.
There are other third party trained data hosted on individual git account. I recommend to merged these trained data files so that people don't need to find out of the box model in random places. Here are the resource I found.

https://github.com/pndaza/tesseract-myanmar

[DataM0del]

Then open a PR...

[stweil]

... but please add any PR for new models in tessdata_contrib.