Started file i/o implementation
Merge branch 'master' of https://github.com/mmhl/ctypist into text-input
Added first file operations
Merge branch 'master' into text-input
Merge branch 'master' into text-input
Slightly refactored lesson.c file
Removed debug message
Merge branch 'text-input' of https://github.com/mmhl/ctypist into text-input
Various small changes in sources