Move file reading and writing to streaming

[Zazama]

This PR implements file streaming for reading files using the NodeID3.read, NodeID3.write (and update) function. By doing so, we support reading/writing big files and go easy on memory.

• We read/write the file in chunks of max. 20 megabytes (if you run node.js, you probably have 20mb to spare)
• The reader will automatically detect the start of an ID3 Tag and extract it fully into a buffer
  • This assumes that ID3 Tags are small enough to fit into memory
  • If it were bigger, the reading would fail anyways, because the parsed information would not fit into memory
• Code is slightly repeated because of sync/async support. I haven't found a better way yet
• On write, we create a temp file next to the original one
  • This is done using the "tmp" module because we need collision handling and I think it's good to keep the files in the same folder so it can be found easily on failure.
  • First, the new ID3 Tag is written at the beginning
  • Then the rest of the old file is streamed into the new one. If an old ID3 Tag is found, it is skipped
• The type definition of a NodeID3.write callback should not return a buffer if a file is being manipulated. This is also how it is documented in the README.md

Related issue: https://github.com/Zazama/node-id3/issues/161