Fix remove_dots()

Rewrite to handle all normal and abnormal examples mentioned in RFC 3986
section 5.4.
The previous implementation failed the following test cases:

'http://www.libupnp.org/path1/path1' | '#frag1' -> 'http://www.libupnp.org/path1/#frag1' != 'http://www.libupnp.org/path1/path1#frag1' (0)
'http://127.0.0.1:6544/getDeviceDesc' | 'CDS_Event' -> 'http://127.0.0.1:6544/CDS_EventDesc' != 'http://127.0.0.1:6544/CDS_Event' (0)
'http://localhost/b/c/d;p?q' | 'g' -> 'http://localhost/b/c/g;p' != 'http://localhost/b/c/g' (0)
'http://localhost/b/c/d;p?q' | 'g/' -> 'http://localhost/b/c/g/p' != 'http://localhost/b/c/g/' (0)
'http://localhost/b/c/d;p?q' | '?y' -> 'http://localhost/b/c/?yp' != 'http://localhost/b/c/d;p?y' (0)
'http://localhost/b/c/d;p?q' | '#s' -> 'http://localhost/b/c/#sp' != 'http://localhost/b/c/d;p?q#s' (0)
'http://localhost/b/c/d;p?q' | ';x' -> 'http://localhost/b/c/;xp' != 'http://localhost/b/c/;x' (0)
'http://localhost/b/c/d;p?q' | '.' -> 'http://localhost/b/c/.;p' != 'http://localhost/b/c/' (0)
'http://localhost/b/c/d;p?q' | './' -> 'http://localhost/b/c/p' != 'http://localhost/b/c/' (0)
'http://localhost/b/c/d;p?q' | '..' -> 'http://localhost/b/c/..p' != 'http://localhost/b/' (0)
'http://localhost/b/c/d;p?q' | '/./g' -> 'http://localhost/./g' != 'http://localhost/g' (0)
'http://localhost/b/c/d;p?q' | '/../g' -> 'http://localhost/../g' != 'http://localhost/g' (0)
'http://localhost/b/c/d;p?q' | 'g.' -> 'http://localhost/b/c/g.p' != 'http://localhost/b/c/g.' (0)
'http://localhost/b/c/d;p?q' | '.g' -> 'http://localhost/b/c/.gp' != 'http://localhost/b/c/.g' (0)

Signed-off-by: Marcelo Roberto Jimenez <mroberto@users.sourceforge.net>
(cherry picked from commit fbbb24f4063bf01013e988afba0e796a6d8dc52e)
Add unit test for parse_uri()

Tested through the public function UpnpResolveURL2().

Signed-off-by: Marcelo Roberto Jimenez <mroberto@users.sourceforge.net>
(cherry picked from commit a596abfbe3c16768468d68124bc728f4060e5e0a)