lll: Rename files according to new inclusion schema
lll: Improve doc comments
toolbox: Rename functions

- Rename Toolbox_XXX_new to Toolbox_XXX_create.
- Rename Toolbox_XXX_delete to Toolbox_XXX_destroy.
toolbox: Add fileinputstream,  fileoutputstream and file
toolbox: Move static asserts into private source file