v0.3.0 release

additions

• added cat.
• added --width to ls.

bug fixes

• added newlines to --version output and ls output, fixing for prompts without a newline at the beginning.
• fixed segfault when running ls on directories without any files.
• fixed segfault when running ls on a non-existent, specified directory.
• fixed problem when running whoami when root, if you are using sudo.

backend changes

• started using clang-format.
• removed unecessary imports using include-what-you-use.
• massive rework of makefile.
• version is now defined using the compiler and makefile, instead of version.h.
• massive cleanup of unused functions in ls.
• moved file functions in ls to file.h.