switch to controllers, dropping /front/* files

setup.php

@@ -51,10 +51,21 @@
 // Schema version of this version (major.minor.bugfix)
 define('PLUGIN_CARBON_SCHEMA_VERSION', '1.3.0');
 
+// Version compatibility check -- from GLPI developer documentation
+// > A bug in GLPI prior to 11.0.7 caused plugin routes with method constraints other than GET to never match.
+// > The router context was always evaluated as GET, so any route declared with only POST, PUT, DELETE, PATCH, etc.
+// > would never be found.
+//
+// > This bug was fixed in GLPI 11.0.7. If your plugin needs to support GLPI < 11.0.7, use the following workaround:
+// > include GET alongside the intended methods and check the actual method manually inside the controller.
+//
+// For now, there is no such controller, then compatibility with GLPI 11.0.0 is still OK.
+// Watch it when adding new controllers.
+
 // Minimal GLPI version, inclusive
-define("PLUGIN_CARBON_MIN_GLPI_VERSION", '11.0.0');
+define('PLUGIN_CARBON_MIN_GLPI_VERSION', '11.0.0');
 // Maximum GLPI version, exclusive
-define("PLUGIN_CARBON_MAX_GLPI_VERSION", '12.0.0');
+define('PLUGIN_CARBON_MAX_GLPI_VERSION', '12.0.0');
 
 define('PLUGIN_CARBON_DECIMALS', 3);