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_crossbow/README.txt

@@ -0,0 +1,45 @@
+Minetest Mod - Crossbow [shooter_crossbow]
+==========================================
+
+Depends: shooter, wool, dye
+
+Adds a crossbow with colored arrows.
+
+Crafting
+========
+
+<color> = grey, black, red, yellow, green, cyan, blue, magenta
+
+A = Arrow        [shooter:arrow_white]
+C = Color Dye    [dye:<color>]
+W = Wooden Stick [default:stick]
+P = Paper        [default:paper]
+S = Steel Ingot  [default:steel_ingot]
+B = Bronze Ingot [default:bronze_ingot]
+
+Crossbow: [shooter_crossbow:crossbow]
+
++---+---+---+
+| W | W | W |
++---+---+---+
+| W | W |   |
++---+---+---+
+| W |   | B |
++---+---+---+
+
+White Arrow: [shooter_crossbow:arrow_white]
+
++---+---+---+
+| S |   |   |
++---+---+---+
+|   | W | P |
++---+---+---+
+|   | P | W |
++---+---+---+
+
+Coloured Arrow: [shooter_crossbow:arrow_<color>]
+
++---+---+
+| C | A |
++---+---+
+

shooter_crossbow/depends.txt

@@ -1,2 +1,3 @@
 wool
+dye
 shooter

shooter_crossbow/description.txt

@@ -0,0 +1 @@
+Adds a crossbow with colored arrows.

shooter_crossbow/init.lua

@@ -1,3 +1,22 @@
+--[[
+Shooter Crossbow [shooter_crossbow]
+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 config = {
 	crossbow_uses = 50,
 	arrow_lifetime = 180,

shooter_crossbow/mod.conf

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