Adding activate_plugin, plugin_activation, plugin_activated, deactivate_plugin, plugin_deactivation, plugin_deactivated hooks.
Adding activate_plugin, plugin_activation, plugin_activated, deactivate_plugin, plugin_deactivation, plugin_deactivated hooks.

activate_plugin - Let current plugins return false to prevent new plugin activation.
plugin_activation - Let newly activated plugin install itself
plugin_activated - Let other plugins react to plugin being installed
deactivate_plugin - Left current plugins return false to prevent plugin deactivation.
plugin_deactivation - Let plugin uninstall itself.
plugin_deactivated - Let other plugins react to plugin being uninstalled.

git-svn-id: d0e296eae3c99886147898d36662a67893ae90b2@685 653ae4dd-d31e-0410-96ef-6bf7bf53c507

dragonmantank/Habari,dragonmantank/Habari,dragonmantank/Habari