UI feedback

Console:
- Increase contrast of table rows on profile/tunnels/peers tables
- Changed pink font to magenta in /logs to increase legibility
- Soften H3 headings in sidebar
- Single click to select I2P Version and Running Environment table text, with
  table:hover color change and text cursor to better reflect selection
  - Modify text above to indicate what exactly needs to be included in logs
- Reduce size of monospace dests in peers/profiles/tunnels, add additional
  spacing (responsive)
- Fix resizing of sidebar reseed button
- De-emphasise siderbar app icons with background-blend-mode: luminosity
- Change sidebar snark icon to match homepage icon
- Bump div.main text color from #222 to #333 (reduce contrast)

i2ptunnel: Increase vertical spacing of H2/H3's

SusiDNS: Change address helper icon to add book icon

i2psnark:
- Remove font-adjust-size (ubergine/vanilla)
  - Was probably causing the navbar links to display too large on some setups
- Add extra spacing to screenlogger bullets (ubergine)

router/java/src/net/i2p/router/transport/UPnP.java

@@ -694,9 +694,11 @@ public class UPnP extends ControlPoint implements DeviceChangeListener, EventLis
 		}
 
 		if(isDisabled) {
+			sb.append("<p>");
 			sb.append(_t("UPnP has been disabled; Do you have more than one UPnP Internet Gateway Device on your LAN ?"));
 			return sb.toString();
 		} else if(!isNATPresent()) {
+			sb.append("<p>");
 			sb.append(_t("UPnP has not found any UPnP-aware, compatible device on your LAN."));
 			return sb.toString();
 		}