API Utility methods

Here is two new utility methods and their implementation in all ATK4 files where I could find something like this. I guess there are more, but ... enough for a start I guess :)

Here is testcase (sorry, not ATK4 file, but plain PHP):
```
<?php
echo "<pre>";
foreach(array(
    'Foo Bar BAz','F01 ba$z','Multi  spaces','multi   space 3','at the end  ',
    ' _ in beginning','UTF8 āčīķš chars'
) as $a){
    echo "[$a] => [".normalizeName($a    )."], [".
                     normalizeName($a,'-')."]<br>";
}
echo "</pre><hr>";
// --------------------------------------------------------
echo "<pre>";
foreach(array(
    'data','Data','Model','Model_Foo','model_Foo','Car-Wash','controller_data',
    'MyClass','Vendor/Addon/Sub/Min','Vendor\Addon\Sub','Vendor_Addon_Sub',
    './Relative'
) as $a){
    echo "[$a] => [".normalizeClassName($a,'Model'     )."], [".
                     normalizeClassName($a,'Grid_Basic')."]<br>";
}
echo "</pre><hr>";
// --------------------------------------------------------

    // {{{ Helper / utility methods
    /**
     * Normalize field or identifier name. Can also be used in URL normalization.
     * This will replace all non alpha-numeric characters with separator.
     * Multiple separators in a row is replaced with one.
     * Separators in beginning and at the end of name are removed.
     * 
     * @param string $name      String to process
     * @param string $separator Character acting as separator
     * 
     * @return string           Normalized string
     */
    function normalizeName($name,$separator='_')
    {
        if(strlen($separator)==0) {
            return preg_replace('|[^a-z0-9]|i','',$name);
        }
        
        $s = $separator[0];
        $name = preg_replace('|[^a-z0-9\\'.$s.']|i',$s,$name);
        $name = trim($name,$s);
        $name = preg_replace('|\\'.$s.'{2,}|',$s,$name);
        
        return $name;
    }
    /**
     * Normalize class name.
     * This will add specified prefix to class name if it's not already added.
     * Class name can have namespaces and they are treated prefectly.
     * 
     * @param string|object $name   Name of class or object
     * @param string        $prefix Prefix for class name
     * 
     * @return string|object Full class name or received object
     */
    function normalizeClassName($name,$prefix)
    {
        if(!is_string($name)) return $name;

        $name = str_replace('/','\\',$name);
        if($prefix) {
            $class = ltrim(strrchr($name,'\\'),'\\')?:$name;
            $prefix = ucfirst($prefix);
            if (strpos($class,$prefix)!==0) {
                $name = preg_replace('|^(.*\\\)?(.*)$|', '\1'.$prefix.'_\2', $name);
            }
        }
        
        return $name;
    }
    // }}}
```