Style: Remove inconsistently used @author docstrings

Each file in Godot has had multiple contributors who co-authored it over the
years, and the information of who was the original person to create that file
is not very relevant, especially when used so inconsistently.

`git blame` is a much better way to know who initially authored or later
modified a given chunk of code, and most IDEs now have good integration to
show this information.

core/object/object.h

@@ -52,10 +52,6 @@
 #define VARIANT_ARGPTRS_PASS *argptr[0], *argptr[1], *argptr[2], *argptr[3], *argptr[4], *argptr[5], *argptr[6]], *argptr[7]
 #define VARIANT_ARGS_FROM_ARRAY(m_arr) m_arr[0], m_arr[1], m_arr[2], m_arr[3], m_arr[4], m_arr[5], m_arr[6], m_arr[7]
 
-/**
-@author Juan Linietsky <reduzio@gmail.com>
-*/
-
 enum PropertyHint {
 	PROPERTY_HINT_NONE, ///< no hint provided.
 	PROPERTY_HINT_RANGE, ///< hint_text = "min,max[,step][,or_greater][,or_lesser][,noslider][,radians][,degrees][,exp][,suffix:<keyword>] range.