change markdown to org for README
rename system to clutils
Move math functions to their own package
split up strings package
move functions to the functional package
remove unnecessary files
fixing stuff
add all.lisp
Add `string-split'
Add some docstrings
Add string-starts-with and string ends-with predicates
Add file to string conversion. And vice versa.
Add symbols to :export
fix docstring
Give structure to readme
Improve documentation.