Support URL parameters

Now, http_payload includes a list of human-readable parameters that can
be read (but not modified) by users. Given the following example link:

/test?key1=value1&key2=value2

This will generate two parameters, with the following values:

{
	.args =
	{
		[0] = {.key = "key1", .value = "value1"},
		[1] = {.key = "key2", .value = "value2"}
	},

	.n_args = 2
}

As expected, if any URL parameters are given, struct http_payload member
"resource" is accordingly trimmed so as not to include any parameters.
Therefore, considering the example above:

{.args = {...}, .resource = "/test"}

Limitations:

- Since the definition of struct http_arg is both shared by http.h
(as a read-only pointer within struct http_payload) and http.c
(as a read/write pointer within struct ctx), its members (namely key
and value) must remain as read/write pointers, even if they must not
be modified by users of http.h.

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