Redo the API

[ararslan]

• EDFFile type -> EDF.File
• EDFFile constructor -> EDF.read
• write_edf -> EDF.write
• EDFHeader -> EDF.Header
• Unexport everything (usually a sad thing to do but okay in this case, as it permits a more concise and descriptive API given the package rename)

Annoyingly, all internal calls to read and write now have to be qualified with Base. since we've introduced conflicting names.

[jrevels]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@93350fb). Click here to learn what that means. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master       #7   +/-   ##
=========================================
  Coverage          ?   98.94%           
=========================================
  Files             ?        3           
  Lines             ?      189           
  Branches          ?        0           
=========================================
  Hits              ?      187           
  Misses            ?        2           
  Partials          ?        0

Impacted Files	Coverage Δ
src/EDF.jl	100% <100%> (ø)
src/read.jl	98.29% <100%> (ø)
src/write.jl	100% <100%> (ø)

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