Add support for dashed lines

[ondras12345]

This PR tries to add support for dashed lines. It seems to work. However, I have no idea what I'm doing. I've never worked on a TypeScript / JavaScript project before. If you decide to merge this, please verify that I haven't broken anything.

One thing that confused me a bit was src/types-config-ti.ts. It seems to be automatically generated by the build system (it can be automatically recreated when deleted). However, for some reason it is included in the git repository. I have commited the changes made by the build system.

[whcrg]

Could this please be added… would make things nicer!