Messages should be consistent regarding present tense vs past tense

[nstoddard]

Some messages use past tense, such as "The dart killed the rat". Others use present tense, such as "The lightning kills the rat". Ideally, most/all messages would use the same tense. The majority of messages currently use present tense, I think, and present tense also seems more common in other roguelikes, so it's likely a better choice than past tense.

The most common messages that would need to be changed are combat-related: many messages about defeating enemies, the message when an attack misses, etc.