Improved query and form data encoding (based on a very early version of the general URI percent-encoding rules).

- now correct encoding of space by '%20' in path segment, and '+' in query parameters.
Unify and fixed query parameters handling for libcurl and net implementation.
Fixed file uploading (various issue in libcurl, and net implementation).
Fixed form multipart encoding by using correctly the boundary.
Updated autotest cases.
Code cleaning.

library/network/http_client/http_client.ecf

@@ -33,6 +33,7 @@
 		</library>
 		<library name="uri" location="$ISE_LIBRARY\library\text\uri\uri.ecf"/>
 		<cluster name="src" location=".\src\">
+			<cluster name="implementation" location="$|implementation" recursive="true" hidden="true"/>
 			<cluster name="spec_null" location="$|spec\null\" recursive="true"/>
 			<cluster name="spec_net" location="$|spec\net\">
 				<condition>