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/http/http.wren

@@ -0,0 +1,19 @@
+// retoor <retoor@molodetz.nl>
+
+import "http" for Url, Http, HttpResponse
+
+var url1 = Url.parse("http://example.com/path")
+System.print(url1.scheme) // expect: http
+System.print(url1.host) // expect: example.com
+System.print(url1.port) // expect: 80
+System.print(url1.path) // expect: /path
+
+var url2 = Url.parse("http://example.com:8080/test?foo=bar")
+System.print(url2.port) // expect: 8080
+System.print(url2.path) // expect: /test
+System.print(url2.query) // expect: foo=bar
+System.print(url2.fullPath) // expect: /test?foo=bar
+
+var url3 = Url.parse("http://localhost/")
+System.print(url3.host) // expect: localhost
+System.print(url3.path) // expect: /