Simplified the (no)caching architecture by:

- removing support for $cache_attrs for registered plugins,
- removing the undocumented {make_nocache} tag and the deprecated {insert} tag and associated code
- removing support for a compile_id property on include tags.

Fixes a bug in extends: resources by propagating the nocache-hashes between a master template and it's subtemplates in \Smarty\Template::_subTemplateRender. This might need further improvement.

docs/programmers/api-functions/api-register-plugin.md

@@ -32,9 +32,9 @@ cache\_attrs
 This method registers functions or methods defined in your script as
 plugin. It uses the following parameters:
 
--   `cacheable` and `cache_attrs` can be omitted in most cases. See
+-   `cacheable` can be omitted in most cases. See
     [controlling cacheability of plugins output](#caching.cacheable) on
-    how to use them properly.
+    how to use this properly.
 
 <!-- -->
 

docs/programmers/api-functions/api-template-exists.md

@@ -55,5 +55,4 @@ And the php script
       
 
 See also [`display()`](#api.display), [`fetch()`](#api.fetch),
-[`{include}`](#language.function.include) and
-[`{insert}`](#language.function.insert)
+and [`{include}`](#language.function.include)