docs: shuffle files to have the same logical hierarchy as on the generated doc

Also:
 - rename some files to remove redundant information from the filenames
 - rename many labels to match the filename and its place in the hierarchy
 - move lua_api under the scripting section

docs/rst/scripting/lua_api/lua_log_api.rst

@@ -0,0 +1,56 @@
+.. _lua_log_api:
+
+Debug Logging
+=============
+
+.. function:: Log.warning(object, message)
+
+   Logs a warning message, like :c:macro:`wp_warning_object`
+
+   :param object: optional object to associate the message with; you
+      may skip this and just start with the *message* as the first parameter
+   :type object: GObject or GBoxed
+   :param string message: the warning message to log
+
+.. function:: Log.notice(object, message)
+
+   Logs a notice message, like :c:macro:`wp_notice_object`
+
+   :param object: optional object to associate the message with; you
+      may skip this and just start with the *message* as the first parameter
+   :type object: GObject or GBoxed
+   :param string message: the normal message to log
+
+.. function:: Log.info(object, message)
+
+   Logs a info message, like :c:macro:`wp_info_object`
+
+   :param object: optional object to associate the message with; you
+      may skip this and just start with the *message* as the first parameter
+   :type object: GObject or GBoxed
+   :param string message: the info message to log
+
+.. function:: Log.debug(object, message)
+
+   Logs a debug message, like :c:macro:`wp_debug_object`
+
+   :param object: optional object to associate the message with; you
+      may skip this and just start with the *message* as the first parameter
+   :type object: GObject or GBoxed
+   :param string message: the debug message to log
+
+.. function:: Log.trace(object, message)
+
+   Logs a trace message, like :c:macro:`wp_trace_object`
+
+   :param object: optional object to associate the message with; you
+      may skip this and just start with the *message* as the first parameter
+   :type object: GObject or GBoxed
+   :param string message: the trace message to log
+
+.. function:: Debug.dump_table(t)
+
+   Prints a table with all its contents, recursively, to stdout
+   for debugging purposes
+
+   :param table t: any table