[module/memory] Display MiB instead of GiB when GiB value is less than 1GiB

[malta895]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update
• Other: Replace this with a description of the type of this PR

Description

Memory/swap values can now be displayed in MiB instead of GiB when the value is less than 1 GiB, for better precision.
For example, display 512 MiB instead of 0.50 GiB.

The following tokens have been added to the memory module in order to activate this behavior from config:

;   %used%
;   %free%
;   %total%
;   %swap_total%
;   %swap_free%
;   %swap_used%

Related Issues & Documents

Closes #2472

Documentation (check all applicable)

• This PR requires changes to the Wiki documentation (describe the changes)
• This PR requires changes to the documentation inside the git repo (please add them to the PR).
• Does not require documentation changes

The documentation of the memory module should be updated with the tokens described earlier, and a description on their behavior.

[codecov]

Codecov Report

Merging #2488 (6663f67) into master (a520fea) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2488      +/-   ##
==========================================
- Coverage   10.12%   10.11%   -0.01%     
==========================================
  Files         147      147              
  Lines       10188    10198      +10     
==========================================
  Hits         1032     1032              
- Misses       9156     9166      +10     

Flag	Coverage Δ
unittests	10.11% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
include/utils/string.hpp	30.76% <ø> (ø)
src/modules/memory.cpp	0.00% <0.00%> (ø)
src/utils/string.cpp	92.30% <0.00%> (-2.94%)	⬇️

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[patrick96]

Very nice! Thanks a lot for helping out 😃

Please also add these changes to the CHANGELOG.md file in the Added section. Also see the relevant section in CONTRIBUTING.md for more info.

[malta895]

Please also add these changes to the CHANGELOG.md file in the Added section. Also see the relevant section in CONTRIBUTING.md for more info.

Done! Sorry I missed that part of contributing 😅

[patrick96]

Looks good now :)

I also changed some small things myself, will merge this once CI is done.