Create module `tower-effectiveness-at-range`

[RiftLurker]

• [x] The module should calculate the effective power a tower can perform at specified range. This is mostly useful for usage along with TOWER_POWER_ATTACK, TOWER_POWER_HEAL or TOWER_POWER_REPAIR.

Optionally create the following modules as well:

• [ ] get-tower-attack-effect - calling get-tower-effect using TOWER_POWER_ATTACK
• [ ] get-tower-heal-effect - calling get-tower-effect using TOWER_POWER_HEAL
• [ ] get-tower-repair-effect - calling get-tower-effect using TOWER_POWER_REPAIR