Adds "Chance to Jam" to Sensor Strength tooltip

* Adds a new attribute to fits, `ecmProjectedStr`, which defaults to `1`. This will store the current modified value of the jam strengths applied to the ship
* Utilizes previously unused effect `ewTestEffectJam` to modify `ecmProjectedStr`
* Adds new property, `jamChance`, to fit
* Adjusts stats pane to include this info in the Sensor Str. tooltip

I originally wanted to have the jam chance show up next to the sensor strength, like so: `Sensor Str.: 14.4 | 30%`. However, due to the way stats are organized (seems they need to be a strict `str: int/float`), I could not achieve this without some major hacking. Something to look more into when time permits.

There is also a bug if you project a fit with overloaded ECM onto a target ship. The target ship will show incorrect chance. This is, as far as I'm aware, not due to this feature but an underlying issue that hasn't been determined yet. I will open a new issue for that.