Renamed "ITL files" folder to "itl"

Because spaces are not desired in path names
Removed support for point intervals

I removed the support for point intervals because they may cause problems
because of unprecise interpretation by the compiler
Note: various.itl can currently not be translated without parse errors, since it
contains point intervals
Removed point intervals from various.itl
Restructured arith.yaml
Added decorated interval to cpp config
Removed remaining point interval code
Added long double support to config files
Cleanup