MP4 tools

[ktp420]

• Add BoxUtil.search which allows searching for boxes
  • search for multiple box "types" in one call
  • searches children of "found" box if there are any
  • converts "type" search string to bytes if specified
  • can specify box type and children key to use
    • Note: children key will be used for all boxes, i.e. only checks box[children_key] and will not search box['children'].

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7e41373) 97.97% compared to head (833615b) 98.43%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
+ Coverage   97.97%   98.43%   +0.46%     
==========================================
  Files           6        6              
  Lines         247      256       +9     
==========================================
+ Hits          242      252      +10     
+ Misses          5        4       -1     

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