Added webapi system and first attempt for the core webapi.

Added user profile system to the core module.
Moved /user/{uid} from auth module to core module.
Added possibility to add html before and after a cms form. (useful to add a form before or after, as nested form are forbidden).
Now theme can be installed using roc install command.

modules/core/site/scripts/user_profile.sql

@@ -0,0 +1,6 @@
+CREATE TABLE user_profiles(
+  `uid` INTEGER NOT NULL CHECK("uid">=0),
+  `key` VARCHAR(255) NOT NULL,
+  `value` TEXT,
+  CONSTRAINT PK_uid_key PRIMARY KEY (uid,key)
+);