Patch: Support for TinyMCE3 Plugins

The plugins that ship with TinyMCE3 are different than those that come with version 2. I have changed plugin_reg.php to reflect those new plugins.
From the v2 plugins, flash and zoom have been removed. Enabling those with TinyMCE3 will cause problems.

Of the new plugins, I didn't enable noneditable, pagebreak and template, because they need further configuration settings and don't necessarily make sense in the context of drupal. But if someone else can figure out how to use them, maybe they are useful.

The file plugin_reg.php hasn't changed between versions 5.x and 6.x of this module, so it will also work with Drupal 5.