Use FusionHash for arena fields.
Use FusionHash for arena fields.

Avoids multiple fields with the same name and just replaces the value.

Should also be a faster for arenas with more than three or four fields.

Minor code cleanup in lock_arena().

Added debug domain and messages.

djbclark/directfb-core-DirectFB,kaostao/directfb,kevleyski/directfb,kevleyski/DirectFB-1,jcdubois/DirectFB,Distrotech/DirectFB,djbclark/directfb-core-DirectFB,dfbdok/DirectFB1,mtsekm/test,dfbdok/DirectFB1,sklnet/DirectFB,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB,kevleyski/directfb,dfbdok/DirectFB1,mtsekm/test,kevleyski/DirectFB-1,kevleyski/DirectFB-1,kevleyski/DirectFB-1,kevleyski/directfb,jcdubois/DirectFB,kaostao/directfb,lancebaiyouview/DirectFB,sklnet/DirectFB,DirectFB/directfb,mtsekm/test,lancebaiyouview/DirectFB,DirectFB/directfb,deniskropp/DirectFB,deniskropp/DirectFB,jcdubois/DirectFB,kaostao/directfb,deniskropp/DirectFB,Distrotech/DirectFB,Distrotech/DirectFB,sklnet/DirectFB,deniskropp/DirectFB,djbclark/directfb-core-DirectFB,djbclark/directfb-core-DirectFB,sklnet/DirectFB,kevleyski/directfb,DirectFB/directfb