API vs internal code

[aescande]

It seems that the current code was left in the middle of a refactoring, with lexlsi and lexlse having only internal code, while the non-internal wrapping in lexls.h is barely exposing any functionalities.

As it stands, the end-user needs for now to use LexLS::internal::LexLSE and LexLS::internal::LexLSI, making the internal namespace confusing.

Two choices here:

• finishing to implement the API classes (but I don't know exactly what was the intended purpose)
• removing lexls.h and moving LexLSI and LexLSE out of internal.

Maybe we can tag Dimitar or Alexander on this one, once the project is switched to public