Minetest_game: Flint and steel wears out if not used

[PilzAdam]

Flint and steel wears out, even if it doesn't create a fire node (i.e. you are pointing at a non burnable node).

Also, the control scheme to place fire with a leftclick is inconsistent with normal node behavior, where you place stuff in the world with a rightclick.

[rubenwardy]

you're using the item as a tool, rather than placing the item like a node

[kilbith]

Sorry, I just applied @paramat's request : https://github.com/minetest/minetest_game/pull/962#discussion_r56846667

I think all attempts at ignition (on flammable or non flammable nodes) should add wear to the flint and steel

[paramat]

Makes sense as it is, if a player repeatedly tries to light a non-flammable node the flint and steel is being used, therefore wear. This is obvious,
There is also wear when attempting to light a protected node, the flint and steel is being used.
If a player is silly enough to repeatedly try to light non-flammable or protected nodes they deserve some wear. We can always increase the uses to compensate as i suggested in the PR.

This seems more like using a tool than directly placing a node.

[paramat]

Closing as current behaviour seems acceptable to most.