Add fine grained error handling #1
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mcphailtom
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This change adds a custom error types and ErrorStateXXX constants to the package. Consumers can respond to them as macro errors or Unwrap with errors.As to interrogate the details.
Most Errors will cause termination but ErrorStateFileRemoved will leave the File Watch active and the file will be reopened if it is recreated. There is room to make this more configurable and optional at a later time but at the moment it solves a problem I need solved simply.