common/hooks: add support for do-<phase> hooks as suggested by Gottox.

- New hooks for do-fetch and do-extract moved from xbps-src.
- Renamed some hooks to have XX as prefix.

common/hooks/README

@@ -13,18 +13,40 @@ The following directories are used to set the order in which the hooks
 should be processed by xbps-src:
 
 	* pre-fetch		(before running fetch phase)
+	* do-fetch		(running fetch phase)
 	* post-fetch		(after running fetch phase)
+
 	* pre-extract		(before running extract phase)
+	* do-extract		(running extract phase)
 	* post-extract		(after running extract phase)
+
 	* pre-configure		(before running configure phase)
+	* do-configure		(running configure phase)
 	* post-configure	(after running configure phase)
+
 	* pre-build		(before running build phase)
+	* do-build		(running build phase)
 	* post-build		(after running build phase)
+
 	* pre-install		(before running install phase)
+	* do-install		(running install phase)
 	* post-install		(after running install phase)
+
 	* pre-pkg		(before running pkg phase)
+	* do-pkg		(running pkg phase)
 	* post-pkg		(after running pkg phase)
 
 NOTES
 ~~~~~
 * Symlinks can be created (relative) to make a hook available in multiple phases.
+
+* The phases do-fetch, do-extract, do-configure, do-build, and do-install can
+  be overwritten by the template file. That means if a template contains a
+  do_install function, the hooks defined for do-install won't be executed.
+  Note that this is only true for the do-* hooks.
+
+* the pre_* function of the template will be run *after* the corresponding
+  pre-* hooks.
+
+* the post_* function of the template will be run *before* the corresponding
+  post-* hooks.