Fix for #407: Show number of hardlinks for lsd -l

[TheAlakazam]

• Added implementation for displaying number of hardlinks to a file.
• Displays '-' in windows

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TODO

• Use cargo fmt
• Add necessary tests
• Add changelog entry

[meain]

Looks good, a few minor changes.

[meain]

I was thinking we could change the name to links. Single word name would be better in this case.

[meain]

Similar to changing inode_count to links, can we also change the name INodeCount to Links.
Plus make sure you add the changelog entry.

[codecov-io]

Codecov Report

Merging #459 (fd8eeb0) into master (1396c59) will decrease coverage by 0.11%.
The diff coverage is 70.37%.

@@            Coverage Diff             @@
##           master     #459      +/-   ##
==========================================
- Coverage   84.58%   84.46%   -0.12%     
==========================================
  Files          35       36       +1     
  Lines        3353     3379      +26     
==========================================
+ Hits         2836     2854      +18     
- Misses        517      525       +8     

Impacted Files	Coverage Δ
src/app.rs	95.83% <ø> (ø)
src/display.rs	24.61% <0.00%> (-0.13%)	⬇️
src/meta/mod.rs	17.69% <50.00%> (+0.58%)	⬆️
src/color.rs	78.64% <66.66%> (-0.36%)	⬇️
src/meta/links.rs	68.75% <68.75%> (ø)
src/flags/blocks.rs	93.91% <100.00%> (+0.10%)	⬆️

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[meain]

Just a few things that you missed.

[meain]

No links by default

Suggested change

	Block::Name,
	Block::Links,
	Block::Name,

[meain]

We could reuse the Inode colors

Suggested change

	m.insert(Elem::Links { valid: true }, Colour::Fixed(134));
	m.insert(Elem::Links { valid: false }, Colour::Fixed(222));
	m.insert(Elem::Links { valid: true }, Colour::Fixed(13));
	m.insert(Elem::Links { valid: false }, Colour::Fixed(245));

[meain]

Awesome, thanks a lot!

[FischLu]

please add links option in the config.yaml example in the README.md file, today I tired to config my lsd with this function, but didn't see it anywhere till I see this pr

[meain]

Added in #808