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/designers/language-basic-syntax/language-syntax-functions.md

@@ -10,7 +10,6 @@ within delimiters like so: `{funcname attr1="val1" attr2="val2"}`.
     {config_load file="colors.conf"}
 
     {include file="header.tpl"}
-    {insert file="banner_ads.tpl" title="My Site"}
 
     {if $logged_in}
         Welcome, <span style="color:{#fontColor#}">{$name}!</span>