Release 1.3.1

Bugfixes:
- Fix UB on infinite loop (was causing problems with at least OpenBSD)
- Fix memory leaks in interactive mode (getline was allocating new
  buffer on each iteration, now it uses global variable for storing)

Small patches:
- Reduce amount of malloc calls in parser function in favor of recursion
- Fix stupid cccl_Executr_OK name
- Rename readfile into allocfile as first variant is poor
- Add cccl_ prefix to str.c (maybe will help if you want to link this
  thing with your project :D)
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