feat: add cJSON and SQLite amalgamation source files under deps/

Add the cJSON library (cJSON.c, cJSON.h) and SQLite amalgamation
(sqlite3.c, sqlite3.h, sqlite3ext.h, shell.c) as vendored dependencies
in the deps/ directory for use by the project build system.

test/websocket/handshake.wren

@@ -0,0 +1,7 @@
+import "websocket" for WebSocket
+
+var accept = WebSocket.computeAcceptKey_("dGhlIHNhbXBsZSBub25jZQ==")
+System.print(accept) // expect: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
+
+var accept2 = WebSocket.computeAcceptKey_("x3JJHMbDL1EzLkh9GBhXDw==")
+System.print(accept2) // expect: HSmrc0sMlYUkAGmm5OPpG2HaGWk=

test/websocket/message.wren

@@ -0,0 +1,34 @@
+import "websocket" for WebSocketMessage
+
+var text = WebSocketMessage.new_(1, [72, 101, 108, 108, 111], true)
+System.print(text.opcode) // expect: 1
+System.print(text.isText) // expect: true
+System.print(text.isBinary) // expect: false
+System.print(text.isClose) // expect: false
+System.print(text.isPing) // expect: false
+System.print(text.isPong) // expect: false
+System.print(text.text) // expect: Hello
+System.print(text.bytes) // expect: [72, 101, 108, 108, 111]
+
+var binary = WebSocketMessage.new_(2, [1, 2, 3, 4], true)
+System.print(binary.opcode) // expect: 2
+System.print(binary.isText) // expect: false
+System.print(binary.isBinary) // expect: true
+System.print(binary.bytes) // expect: [1, 2, 3, 4]
+
+var close = WebSocketMessage.new_(8, [3, 232], true)
+System.print(close.opcode) // expect: 8
+System.print(close.isClose) // expect: true
+System.print(close.closeCode) // expect: 1000
+
+var closeWithReason = WebSocketMessage.new_(8, [3, 232, 98, 121, 101], true)
+System.print(closeWithReason.closeCode) // expect: 1000
+System.print(closeWithReason.closeReason) // expect: bye
+
+var ping = WebSocketMessage.new_(9, [], true)
+System.print(ping.isPing) // expect: true
+System.print(ping.isPong) // expect: false
+
+var pong = WebSocketMessage.new_(10, [], true)
+System.print(pong.isPing) // expect: false
+System.print(pong.isPong) // expect: true

test/websocket/server_client.wren

@@ -0,0 +1,52 @@
+import "websocket" for WebSocket, WebSocketServer
+import "scheduler" for Scheduler
+import "timer" for Timer
+
+var testResults = []
+var port = 19876
+
+Scheduler.add {
+  var server = WebSocketServer.bind("127.0.0.1", port)
+  var ws = server.accept()
+  if (ws != null) {
+    var msg = ws.receive()
+    if (msg != null && msg.isText) {
+      testResults.add("server:" + msg.text)
+      ws.send("pong:" + msg.text)
+    }
+    msg = ws.receive()
+    if (msg != null && msg.isBinary) {
+      testResults.add("server_binary:" + msg.bytes.count.toString)
+      ws.sendBinary(msg.bytes)
+    }
+    ws.close()
+  }
+  server.close()
+}
+
+Timer.sleep(50)
+
+Scheduler.add {
+  var ws = WebSocket.connect("ws://127.0.0.1:%(port)")
+  ws.send("ping")
+  var msg = ws.receive()
+  if (msg != null && msg.isText) {
+    testResults.add("client:" + msg.text)
+  }
+  ws.sendBinary([1, 2, 3, 4, 5])
+  msg = ws.receive()
+  if (msg != null && msg.isBinary) {
+    testResults.add("client_binary:" + msg.bytes.count.toString)
+  }
+  ws.close()
+}
+
+Timer.sleep(200)
+
+for (r in testResults) {
+  System.print(r)
+}
+// expect: server:ping
+// expect: client:pong:ping
+// expect: server_binary:5
+// expect: client_binary:5