major refactor, numenculature change

remove mentions to "door" status, to space

wp-spaceapi-consumer-config.php

@@ -1,5 +1,5 @@
 <?php
 
-define( 'DSI_API_URL',   'https://lcdporto.org/api/spaceapi' );
-define( 'DSI_CACHE_KEY', 'dsi_space_api_status' );
-define( 'DSI_CACHE_TTL', 10 );
+define( 'SSI_API_URL',   'https://lcdporto.org/api/spaceapi' );
+define( 'SSI_CACHE_KEY', 'ssi_space_api_status' );
+define( 'SSI_CACHE_TTL', 10 );