style selector can be longer than 255 (1024, now)

use TEXT insead of bigger VARCHAR to be MySQL 4.1 compatibile

Hab ich gebraucht: 
```
.mod_navigation a:hover,
.mod_navigation span.active,
.mod_navigation span.trail,
.mod_navigation a.trail,
.mod_changelanguage a:hover,
.mod_changelanguage span.active,
#main_menu.mod_navigation a:hover,
#main_menu.mod_navigation a.trail,
#main_menu.mod_navigation span.trail
```
dieses ganze span/a .active/.trail ...
255 Buchstaben sind einfach zu wenig