Add sugar for sendChunk

Use Tox header for all imports, especially enums

Passing Nim enum pointers to the C library was trashing the stack.

Add foreignDeps metadata

Nim 1.0.2 compability, nimpretty

REUSE compliant licensing metadata

Equality operator for index types, its good for tables

A sensible typing status setter

Make FileId an array[32,byte] alias

Use type inference for "send"

Use cstring to avoid unsafeAddr when passing strings to C

Configure options via callback

The options object requires manual memory management, so use a callback
to set options on a managed temporary object during newTox().

Rename File type to FileTransfer

Add hash procedure

close/isClosed

Address utilities

Pretty callback setters

Replace the "tox.callbackX = proc (…) = …" with the
prettier "tox.onCallbackX do (…): …" format.

Add README, LICENSE, example

Add IOEffect tags

Initial commit