Update license and include source headers

Pass a deep copy of gunspec instead of a direct reference

Fix Lua style multi-line comments :/

Fix flaregun dependencies

Add mod.conf and description files plus some readme fixes

shooter_turret/README.txt

@@ -0,0 +1,25 @@
+Minetest Mod - Turret Gun [shooter_turret]
+==========================================
+
+Depends: shooter_rocket
+
+Adds a mountable turret gun which can also be triggered by mesecon signals.
+Still WIP and experimental and may be subject to change or removal.
+
+Crafting
+========
+
+S = Steel Ingot  [default:steel_ingot]
+B = Bronze Ingot [default:bronze_ingot]
+D = Diamond      [default:diamond]
+
+Turret Gun: [shooter_turret:turret]
+
++---+---+---+
+| B | B | S |
++---+---+---+
+|   | B | S |
++---+---+---+
+|   | D |   |
++---+---+---+
+

shooter_turret/description.txt

@@ -0,0 +1,2 @@
+Adds a mountable turret gun which can also be triggered by mesecon signals.
+Still WIP and experimental and may be subject to change or removal.

shooter_turret/init.lua

@@ -1,3 +1,22 @@
+--[[
+Shooter Turret Gun [shooter_turret]
+Copyright (C) 2013-2019 stujones11, Stuart Jones
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+]]--
+
 local use_player_api = minetest.get_modpath("player_api")
 
 local function get_turret_entity(pos)

shooter_turret/mod.conf

@@ -0,0 +1 @@
+name = shooter_turret