Rename relocated.bundle to AppImage

[ndeloof]

- What I did Renamed relocated.bundle to AppImage bundleStore to ImageStore bndl variables to img

- How I did it asked my IDE to do the job for me

- How to verify it You don't read code using a bundle that is more than just a cnab bundle.

- Description for the changelog Introduced AppImage type and ImageStore

- A picture of a cute animal (not mandatory)

[codecov[bot]]

Codecov Report

Merging #773 into master will decrease coverage by 0.08%. The diff coverage is 87.15%.

@@            Coverage Diff             @@
##           master     #773      +/-   ##
==========================================
- Coverage    70.4%   70.32%   -0.09%     
==========================================
  Files          67       67              
  Lines        3740     3740              
==========================================
- Hits         2633     2630       -3     
- Misses        760      762       +2     
- Partials      347      348       +1

Impacted Files	Coverage Δ
internal/store/installation.go	78.12% <100%> (ø)	:arrow_up:
internal/commands/run.go	62.36% <100%> (ø)	:arrow_up:
internal/packager/bundle.go	64% <100%> (ø)	:arrow_up:
internal/commands/image/list.go	81.53% <100%> (ø)	:arrow_up:
internal/commands/pull.go	64.28% <100%> (ø)	:arrow_up:
internal/commands/build/build.go	62.23% <100%> (ø)	:arrow_up:
internal/store/app.go	73.33% <100%> (ø)	:arrow_up:
internal/commands/image/inspect.go	66.66% <100%> (ø)	:arrow_up:
internal/store/digest.go	84% <100%> (ø)	:arrow_up:
internal/commands/image/tag.go	84.21% <100%> (ø)	:arrow_up:
... and 9 more

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