useless files removed and code updated

file characters was a copy error, sounds/... too. Hit structures's sound is defined in case of `on_punch` function.
	new file:   textures/jeija_mesecon_crossing_off.png
	new file:   textures/jeija_mesecon_curved_off.png
	new file:   textures/jeija_mesecon_t_junction_on.png
	new file:   textures/wires_bump_off.png
	new file:   textures/wires_inv.png
	new file:   textures/wires_on.png
	new file:   textures/wires_vertical_on.png
	remove:     characters
Merge branch 'master' of https://github.com/jimy-byerley/minetest-technology

Conflicts:
	README.md

	modified:   README.md