98_Hyperion: fix wrong priority for off, fix dim/dimUp/dimDown, clear clears now the default priority without argument, extend default attr webCmd, new default attr cmdIcon
98_Hyperion: fix wrong priority for off, fix dim/dimUp/dimDown, clear clears now the default priority without argument, extend default attr webCmd, new default attr cmdIconView Changes
Source: 98_Hyperion: fix wrong priority for off, fix dim/dimUp/dimDown, clear clears now the default priority without argument, extend default attr webCmd, new default attr cmdIcon (https://sourceforge.net/p/fhem/code/12461/)