Move events into their own module

The events were cluttering the `model` module, and so are now moved into
their own `model::event` module.

As users should not usually have to work with events all that much -
only currently in some rarely used event handlers - this change should
not be much more effort to import from.

i.e.:

```rs
use serenity::model::event::ChannelPinsAckEvent;
```
vs. the now-old:

```rs
use serenity::model::ChannelPinsAckEvent;
```

1 files changed, 2 insertions, 1 deletions

diff --git a/src/client/dispatch.rs b/src/client/dispatch.rs
index afe9a43..1332d8e 100644
--- a/src/client/dispatch.rs
+++ b/src/client/dispatch.rs
@@ -4,7 +4,8 @@ use super::event_store::EventStore;
 use super::login_type::LoginType;
 use super::Context;
 use super::gateway::Shard;
-use ::model::{ChannelId, Event, Message};
+use ::model::event::Event;
+use ::model::{ChannelId, Message};
 
 #[cfg(feature="framework")]
 use ::ext::framework::Framework;