Better grenades

[econoraptor]

Most demos seem to have at least a few missing detonate events from times we would fully expect the event to be present. This PR interpolates the detonate events by tracking their associated entities

Additions:

• Interpolate detonate starts and ends for smokes, molotovs/incendiaries, and decoys. Interpolations are accurate to the tick for smokes and molotovs, but there's an issue with decoys (see below).
• Includes detonate ends at the end of round, which used to not be captured
• EntityID handle on NadeArgs. This is a much more convenient way of matching detonate start and end events for a user. This is especially true now since interpolated positions arent perfect, though accuracy seems to be within one cell.
• Interpolated bool added NadeArgs so that user can choose to use the position from a matching detonate event if one is interpolated and the other is uninterpolated.
• ProjectileEntityID added to blind events

Problems:

• As previously mentioned, positions aren't perfect, but they're really close
• Decoys are sketchy. There's no property that signals the detonate start, but sometime before the detonate starts there is a flag set. After checking ~600 demos, I've settled on a 2 second threshold between the flag and interpolating the detonate start (to be clear, I'm referring to when it starts making noise, the explosion tick is accurate).
• It's possible for entities to be replaced rather than destroyed. My code works as long as the entity isn't replaced by an entity with the same class, which I have yet to see in the demos I've checked.

[econoraptor]

You may want to hold off on merging/testing this. After messing around with grenades I checked some other entities and realized that a lot of events can be more reliably handled by looking up entity properties. I'll make a number of PRs when I'm finished with the changes and you can decide which you want in the main branch.