Cassette fix

[craigthomas]

This PR fixes an issue with cassette images not having the proper EOF block at the end of the data array. All cassette tape images must have the EOF block of bytes:

`55, 3C, FF, 00, FF, 55`

A new function called checkForEOF was added to check for the proper byte pattern. The function will attempt to fix the EOF pattern so that the cassette tape will load. Unit tests added to match new functionality.

[codecov]

Codecov Report

Merging #28 into master will increase coverage by 0.1%.
The diff coverage is 88.46%.

@@             Coverage Diff             @@
##             master      #28     +/-   ##
===========================================
+ Coverage     68.76%   68.87%   +0.1%     
- Complexity     1024     1030      +6     
===========================================
  Files            43       43             
  Lines          4790     4816     +26     
  Branches        432      437      +5     
===========================================
+ Hits           3294     3317     +23     
- Misses         1405     1406      +1     
- Partials         91       93      +2

Impacted Files	Coverage Δ	Complexity Δ
...a/ca/craigthomas/yacoco3e/components/Cassette.java	81.81% <88.46%> (+2.05%)	33 <6> (+6)	⬆️

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