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make color related functions accept a color table created with color()

--- a/api.c

+++ b/api.c

@@ -151,8 +151,22 @@

 	c = lua_gettop(L);

 	if(c == 1){

-		g = luaL_checkinteger(L, 1);

-		i = color(g, g, g, 0);

+		if(lua_istable(L, 1)){

+			lua_pushstring(L, "r");

+			lua_gettable(L, 1);

+			r = luaL_checkinteger(L, -1);

+			lua_pushstring(L, "g");

+			lua_gettable(L, 1);

+			g = luaL_checkinteger(L, -1);

+			lua_pushstring(L, "b");

+			lua_gettable(L, 1);

+			b = luaL_checkinteger(L, -1);

+		}else{

+			r = luaL_checkinteger(L, 1);

+			g = r;

+			b = r;

+		}

+		i = color(r, g, b, 0);

 	}else if(c == 3){

 		r = luaL_checkinteger(L, 1);

 		g = luaL_checkinteger(L, 2);