[ticket/10438] Alligning the Smileys on the same line as the text.

Changed the styling of smilies to appear at the same level as
text, by adding vertical-align: text-bottom css property to all
smilies. Edited functions_content.php to add class="smilies"
to all parsed smilies.

PHPBB3-10438

phpBB/styles/prosilver/theme/common.css

@@ -713,3 +713,7 @@ p.rules a {
 .hidden {
 	display: none;
 }
+
+.smilies {
+	vertical-align: text-bottom;
+}