add color for modified registers

[syheliel]

Fix #1082

[codecov-commenter]

Codecov Report

Merging #1127 (dec1244) into dev (6d57329) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #1127      +/-   ##
==========================================
- Coverage   50.23%   50.23%   -0.01%     
==========================================
  Files         171      171              
  Lines       19875    19877       +2     
  Branches     1813     1814       +1     
==========================================
  Hits         9985     9985              
- Misses       9553     9555       +2     
  Partials      337      337              

Impacted Files	Coverage Δ
pwndbg/commands/context.py	38.16% <0.00%> (-0.18%)	⬇️

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[arcz]

This is how it looks now, I think it's a nice improvement.

[disconnect3d]

@syheliel we should make that color configurable and displayed with the theme command I think. It should also probably color the star symbol?

[disconnect3d]

Thanks!