Refactor and more

• Refactor a part of the code. Make better naming conventions
• Rework the build process ( #62 (closed) )
• Close files after use in repo.c when downloading a kara from kurisu ( #65 (closed) )
• The repo module as a true module ( #66 (closed) )
• Add a CI to test lektor ( #70 (closed) )
• Custom assert that can be disablef at runtime ( #67 (closed) )

Solves #62 (closed) #65 (closed) #66 (closed) #70 (closed) #67 (closed)

Bug to be solved:

• Make lektor compiles when not building with static modules
• Make lektor quitable again (lkt adm kill must exit lektord)