Added :all Symbol to Javis

[TheCedarPrince]

PR Checklist

If you are contributing to Javis.jl, please make sure you are able to check off each item on this list:

• Did I update CHANGELOG.md with whatever changes/features I added with this PR?
• Did I make sure to only change the part of the file where I introduced a new change/feature?
• Did I cover all corner cases to be close to 100% test coverage (if applicable)?
• Did I properly add Javis dependencies to the Project.toml + set an upper bound of the dependency (if applicable)?
• Did I properly add test dependencies to the test directory (if applicable)?
• Did I check relevant tutorials that may be affected by changes in this PR?
• Did I clearly articulate why this PR was made the way it was and how it was made?

Link to relevant issue(s)
Closes #247

How did you address these issues with this PR? What methods did you use?

I added to the Frames.jl and Object.jl file code to allow for finding the maximum of a background frame. I did not add tests as I saw that we have not added tests for the :same keyword. Should we add testing? Does the logic make sense here for what I did?

[codecov]

Codecov Report

Merging #303 (00961c7) into master (dca8210) will increase coverage by 0.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #303      +/-   ##
==========================================
+ Coverage   95.94%   96.33%   +0.39%     
==========================================
  Files          21       21              
  Lines        1012     1120     +108     
==========================================
+ Hits          971     1079     +108     
  Misses         41       41              

Impacted Files	Coverage Δ
src/Javis.jl	97.54% <ø> (+0.14%)	⬆️
src/structs/Object.jl	100.00% <ø> (ø)
src/structs/Frames.jl	100.00% <100.00%> (ø)
src/backgrounds.jl	100.00% <0.00%> (ø)
src/structs/Video.jl	100.00% <0.00%> (ø)
src/structs/Action.jl	100.00% <0.00%> (ø)
src/action_animations.jl	100.00% <0.00%> (ø)
src/structs/ObjectSetting.jl	100.00% <0.00%> (ø)
... and 9 more

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[Wikunia]

One minor thing you might want to add and yes please add test cases. I think we actually have some for :same. Maybe not unit tests but we use it in some animations.

[Wikunia]

You might wanna have a look @TheCedarPrince
Do you think this is ready for merging?

[TheCedarPrince]

Hey @Wikunia - I tested this out yesterday and all the tests passed on my end! I ran into the ImageIO issue (#315) similar to @flyaflya while testing so I will continue experimenting there. Otherwise, I approve this PR! Feels good to be getting in the groove again! 😉