Stream to Excel table (#530)
* Support all datatypes for StreamWriter * Support setting styles with StreamWriter **NOTE:** This is a breaking change. Values are now explicitly passed as a []interface{} for simplicity. We also let styles to be set at the same time. * Create function to write stream into a table * Write rows directly to buffer Avoiding the xml.Encoder makes the streamer faster and use less memory. Using the included benchmark, the results went from: > BenchmarkStreamWriter-4 514 2576155 ns/op 454918 B/op 6592 allocs/op down to: > BenchmarkStreamWriter-4 1614 777480 ns/op 147608 B/op 5570 allocs/op * Use AddTable instead of SetTable This requires reading the cells after they have been written, which requires additional structure for the temp file. As a bonus, we now efficiently allocate only one buffer when reading the file back into memory, using the same approach as ioutil.ReadFile. * Use an exported Cell type to handle inline styles for StreamWriter
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