Initial support for loading Apache Arrow data #11
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There is a bug in emval.js's implementation of craftEmvvalAllocator when using dynamic execution where the HEAP32 pointer is passed into the exec'd function and hence doesn't point to the enw global pointer when the heap is grown.
This was referenced Aug 26, 2020
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Initial implementation of Apache Arrow data loading into perspective (https://arrow.apache.org/), supporting all basic types (bool,f32,f64,i8,i16,i32,i64) as well as datetimes (as long as they are at millisecond resolution), string columns and dictionary encoded string columns. For basic binary types this PR implements a fast path that can copy the data straight out of the arrow buffer into perspective's data columns.