Release 182: Signs and Portals++!

[james]

Updated OP to include details of 182.4 bug fix release.

@james

Release 182.4:

• Fix an issue where the game would freeze when dragging or resizing the game window on Windows.
• Prevent a rare client crash when aborting chunk requests which are no longer required.
• Improve stability of the client chunk cache to try and prevent a rare client crash.