Better explosive timers

Because seriously:

* C4's timer can now be set to any (positive) integer, not just 0-9.
* Mininukes now use the same timer input system instead of giving you ten turns to escape.

When the Journalist tier rewards get implemented, I'm definitely going to lampshade *this* one.

"The device I found is known as a 'mininuke' - all the destructive power of an atom bomb confined to a space the size of a house. Fortunately, this model has a programmable timer. I had heard of prototype models that gave the user barely a minute to escape, ensuring they would be caught in the blast unless they used hard drugs to push their body to move faster. *Who would invent such a thing?*"