Refactor pyraview MEX and implement readFile functions #29

Job	Run time
Build & Test (windows-latest)	1m 4s
Build & Test (ubuntu-latest)	12s
Build & Test (macos-latest)	15s
Build & Test Matlab (windows-latest)	3m 10s
Build & Test Matlab (macos-latest)	3m 29s
Build & Test Matlab (ubuntu-latest)	1m 54s
	10m 4s

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