Feature/php8 support (#629)

Adds support for PHP8.0, dropping support for PHP7.0 and below.

Backwards incompatible changes:
- Dropped support for php asp tags in templates (removed from php since php7.0)
- Dropped deprecated API calls that where only accessible through SmartyBC
- Dropped support for {php} and {include_php} tags and embedded PHP in templates. Embedded PHP will now be passed through as is.
- Removed all PHP_VERSION_ID and compare_version checks and conditional code blocks that are now no longer required
- Dropped deprecated SMARTY_RESOURCE_CHAR_SET and SMARTY_RESOURCE_DATE_FORMAT constants
- Dropped deprecated Smarty::muteExpectedErrors and Smarty::unmuteExpectedErrors API methods
- Dropped deprecated $smarty->getVariable() method. Use $smarty->getTemplateVars() instead.
- $smarty->registerResource() no longer accepts an array of callback functions

See the changelog for more details.

Switched CI from Travis to Github CI.

libs/plugins/function.html_options.php

@@ -21,7 +21,7 @@
  * - id         (optional) - string default not set
  * - class      (optional) - string default not set
  *
- * @link   http://www.smarty.net/manual/en/language.function.html.options.php {html_image}
+ * @link   https://www.smarty.net/manual/en/language.function.html.options.php {html_image}
  *           (Smarty online manual)
  * @author Monte Ohrt <monte at ohrt dot com>
  * @author Ralf Strehle (minor optimization) <ralf dot strehle at yahoo dot de>