Resolve module paths relative to the current module (#2976)

The current module implementation resolves module paths relative to the
current working directory, but paths should be resolved relative to the
currently evaluated module/source.

This requires a change in the jerry_port_normalize_path port API
function, so that it also takes the current module path as an argument.
On the engine side, we now also create a module object for the main
script, so that we can properly identify the base path for other
modules.

Co-authored-by: Marko Fabo <mfabo@inf.u-szeged.hu>
JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

docs/05.PORT-API.md

@@ -118,9 +118,11 @@ jerry_port_release_source (uint8_t *buffer_p) /**< buffer to free */
 size_t
 jerry_port_normalize_path (const char *in_path_p, /**< input file path */
                            char *out_buf_p,       /**< output buffer */
-                           size_t out_buf_size)   /**< size of output buffer */
+                           size_t out_buf_size,   /**< size of output buffer */
+                           char *base_file_p)     /**< base file path */
 {
   // normalize in_path_p by expanding relative paths etc.
+  // if base_file_p is not NULL, in_path_p is relative to that file
   // write to out_buf_p the normalized path
   // return length of written path
 } /* jerry_port_normalize_path */