Refactor Kaidan.{cpp,h}

The changes in other files than Kaidan.cpp and Kaidan.h are just fallout from renaming some functions in the api of the Kaidan class.

Changes:

• remove get from getters
• use enums properly
• don't use c-style casts
• use m_

In short, make the code look like it was not written by us in 2017