Parser for ancient todo-bichig

[vmonakhov]

Kalmyk colleagues asked to add an hfst-parser for ancient todo-bichig. It should be used the same way as the parser for modern kalmyk language. Necessary data-files for new parser were received. Corresponding label for menu line: Парсер старокалмыцкой письменности (тодо-бичиг)

[vmonakhov]

The parser was added. https://github.com/ispras/lingvodoc/compare/heavy_refactor...ancient_kalmyk_parser

Here are source data-files for it: https://github.com/ispras/lingvodoc/tree/ancient_kalmyk_parser/lingvodoc/static/parsers/hfst/anc_xal

This branch will be merged and removed later on.