allow user defined subdir

# Used Defiend Dirs

allowing the users to define there own names for 
- `lib/`
- `man/`

Giving developers more freedom over how they layout there projects.
check out the following files
- `lib/toml.sh`
- `lib/install.sh`
- `lib/update.sh`

```toml
[dirs]
lib=""
man=""
```