Use texture mods for ctf_trap textures

[LoneWolfHT]

All of the unwalkable nodes can use something like [colorize There were also requests to make the overlays a little less obvious, that could be done too

[appgurueu]

All of the unwalkable nodes can use something like [colorize There were also requests to make the overlays a little less obvious, that could be done too

Note that this will limit texture pack customizability.

[LoneWolfHT]

All of the unwalkable nodes can use something like [colorize There were also requests to make the overlays a little less obvious, that could be done too

Note that this will limit texture pack customizability.

Or exploitability

[xenonca]

For context: #462

[savilli]

I think we don't need it because the proposed solution doesn't solve the texture pack abuse problem. If you make the cobble's texture 100% white, trap nodes will be easily distinguishable.

[appgurueu]

I'm afraid that texture modifers for nodes can't fix any TP abuse problems as there is override.txt:

**Texture Overrides**

You can override the textures of nodes and items from a texture pack using texture overrides. To do this, create one or more files in a texture pack called override.txt

Each line in an override.txt file is a rule. It consists of

itemname target texture

For example,

default:dirt_with_grass sides default_stone.png

or

default:sword_steel inventory my_steel_sword.png

from https://github.com/minetest/minetest/blob/master/doc/texture_packs.txt

[LoneWolfHT]

We are left with having less textures then