Moved functions out of boot.php into class

- z_root() => $a->getBaseURL()
- absurl() => removed because no usage
- is_ajax() => $a->isAjax()
- current_load() => System::currentLoad()
- argc() => $a->argc
- argv($x) => $a->getArgumentValue($x)

boot.php

@@ -475,44 +475,6 @@ function defaults() {
 	return $return;
 }
 
-/**
- * @brief Returns the baseurl.
- *
- * @see System::baseUrl()
- *
- * @return string
- * @TODO Function is deprecated and only used in some addons
- */
-function z_root()
-{
-	return System::baseUrl();
-}
-
-/**
- * @brief Return absolut URL for given $path.
- *
- * @param string $path given path
- *
- * @return string
- */
-function absurl($path)
-{
-	if (strpos($path, '/') === 0) {
-		return z_path() . $path;
-	}
-	return $path;
-}
-
-/**
- * @brief Function to check if request was an AJAX (xmlhttprequest) request.
- *
- * @return boolean
- */
-function is_ajax()
-{
-	return (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest');
-}
-
 /**
  * @brief Function to check if request was an AJAX (xmlhttprequest) request.
  *
@@ -1175,46 +1137,6 @@ function validate_include(&$file)
 	return $valid;
 }
 
-function current_load()
-{
-	if (!function_exists('sys_getloadavg')) {
-		return false;
-	}
-
-	$load_arr = sys_getloadavg();
-
-	if (!is_array($load_arr)) {
-		return false;
-	}
-
-	return max($load_arr[0], $load_arr[1]);
-}
-
-/**
- * @brief get c-style args
- *
- * @return int
- */
-function argc()
-{
-	return get_app()->argc;
-}
-
-/**
- * @brief Returns the value of a argv key
- *
- * @param int $x argv key
- * @return string Value of the argv key
- */
-function argv($x)
-{
-	if (array_key_exists($x, get_app()->argv)) {
-		return get_app()->argv[$x];
-	}
-
-	return '';
-}
-
 /**
  * @brief Get the data which is needed for infinite scroll
  *