Make parser handle marshalling an un marshalling of external files

[shresthagrawal]

While reverse engineering I discovered two things:

• There is a control code 1300 which stores the location of the disk(internal or external) from the root
• everything that was previously considered as the system name was actually disk name.

Things to be done

• Add test for un-marshalling of file-ref pointing to external disk
• Add a new field isExternal to the file ref class, this will be useful while marshalling it
• Change all the systemName to diskName
• Make the un-marshalling recognise external disk, create appropriate location for such cases
• Add test for marshalling of external disk
• for the setLocation function, recognise if the new location is internal or external based on that change the fields isExternal, diskName
• modify Marshall to handle external disk marshalling

[codecov]

Codecov Report

Merging #17 into master will decrease coverage by 0.00%.
The diff coverage is 94.91%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   92.71%   92.70%   -0.01%     
==========================================
  Files          13       13              
  Lines         453      480      +27     
  Branches       41       43       +2     
==========================================
+ Hits          420      445      +25     
  Misses         15       15              
- Partials       18       20       +2     

Impacted Files	Coverage Δ
lib/fileref/fileref.ts	96.55% <83.33%> (-3.45%)	⬇️
lib/fileref/fileref-data.ts	89.62% <95.12%> (+1.25%)	⬆️
test/fileref-test.ts	100.00% <100.00%> (ø)

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[snvfk1n]

during testing, i've noticed that the resource path is somehow appended twice, for instance the file foo.mp3 will be moved to the resources/ directory, but internally in the Live project, it will we referenced as resources/foo.mp3/foo.mp3.