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Implement --directory and --strip-components for tar

Support gzip and xz extraction; verbose

Implement -c flag to grep

Add -v argument to grep

Screenfetch uptime fmt

Removed variable declarations and moved them to an inner block. All 5
variables were unused in the rest of the code.

screenfetch used to output unformatted uptime, i.e. 180s instead of the
expected 3m. This commit adds basic formatting.

The formatting string is as follows:
"{}d {}h {}m {}s"

Example output:
2d 11h 6m 37s

Add keymap utility

Allow numbers to start with a decimal point

screenfetch: Trim trailing whitespace from CPU

The raw_cpuid crate passes the CPU brand string with trailing whitespace which borks the output. According to the tests of that crate it's an expected behaviour so the whitespace needs to be removed here.