Remove obsolete IChatHandler.revise() method.
Adjusted parsing of chat for compatibility with new Minecraft chat features.

 * IChatComponent instances are passed all the way through so that links and other rich chat features are not disrupted.
 * Chat highlighting still breaks all of that and must be adjusted to treat IChatComponents very gently.
 * Removed the /tag command. The original motivation for pre-defining chat patterns (line splitting at the server) no longer occurs. A better way to filter chat will be provided later.
 * Retested CoreProtect parsing with version 2.0.8 for Bukkit 1.7.2; no changes since 2.0.5.
 * Retested Prism parsing with version 2.0 Beta 4. Added support for the new formatting in Prism 2.0.
Removed obsolete build scripts.