chore: unused imports as errors (#111)

config.nims

@@ -0,0 +1 @@
+switch("warningAsError", "UnusedImport:on")

quic/transport/connectionid.nim

@@ -1,5 +1,4 @@
 import std/strutils
-import std/hashes
 import bearssl/rand
 
 type ConnectionId* = seq[byte]

quic/transport/ngtcp2/native/certificateverifier/extcertificateverifier.nim

@@ -4,7 +4,6 @@ import sequtils
 import ./certificateverifier
 import ../pointers
 import ../../../../helpers/openarray
-import ../../../../errors
 
 type
   extVerifyCertificateT = object of ptls_verify_certificate_t

quic/transport/ngtcp2/streamstate/closestate.nim

@@ -2,7 +2,6 @@ import ../../../errors
 import ../../../basics
 import ../../stream
 import ../../framesorter
-import ../native/connection
 import ./basestate
 
 type ClosedStreamState* = ref object of BaseStreamState

quic/transport/ngtcp2/streamstate/receivestate.nim

@@ -2,7 +2,6 @@ import ../../../errors
 import ../../../basics
 import ../../stream
 import ../../framesorter
-import ../native/connection
 import ./basestate
 import ./closestate
 

tests/quic/testListener.nim

@@ -1,4 +1,3 @@
-import bearssl/rand
 import chronos
 import chronos/unittest2/asynctests
 import quic

tests/quic/testPerf.nim

@@ -1,11 +1,8 @@
 import std/sequtils
 import pkg/chronos
 import pkg/chronos/unittest2/asynctests
-import pkg/quic/errors
 import pkg/quic/transport/stream
 import pkg/quic/transport/quicconnection
-import pkg/quic/transport/ngtcp2/native
-import pkg/quic/udp/datagram
 import pkg/stew/endians2
 import ../helpers/simulation
 

tests/quic/testQuicConnection.nim

@@ -1,4 +1,3 @@
-import bearssl/rand
 import chronos
 import chronos/unittest2/asynctests
 import quic/errors

tests/quic/testStreams.nim

@@ -7,7 +7,6 @@ import pkg/quic/transport/quicconnection
 import pkg/quic/transport/ngtcp2/native
 import pkg/quic/udp/datagram
 import ../helpers/simulation
-import ../helpers/contains
 
 proc newData(size: int, val: uint8 = uint8(0xEE)): seq[uint8] =
   var data = newSeq[uint8](size)