Add em and rem to jive::Length

[ImJimmi]

No description provided.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (a8d5147) 92.58% compared to head (b908abe) 92.60%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   92.58%   92.60%   +0.02%     
==========================================
  Files         100      101       +1     
  Lines        9752     9834      +82     
==========================================
+ Hits         9029     9107      +78     
- Misses        723      727       +4     

Files	Coverage Δ
jive_core/geometry/jive_Length.h	100.00% <ø> (ø)
jive_core/geometry/jive_Length.cpp	96.24% <95.34%> (-1.91%)	⬇️

... and 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.