Instead of using `short key_type`, use `eBezTriple_KeyframeType key_type`,
so that it's clear which type it is, and so that a `switch()` can cause
compiler warnings when it's incomplete.
This also adds missing `case`s to `switch`es where necessary, in a way
that doesn't affect the outcome. There is one change that looks like it
is a functional change, but it should provide the same result:
```diff
- size -= 0.8f * key_type;
+ size *= 0.8f;
```
Since `size = 12` and in this case `key_type = 3`, the numerical values
are the same, but now the code is consistently multiplying and thus should
scale properly.
Furthermore some overly obvious comments are removed and some missing
`const` keywords have been added.
No functional changes.
Pull Request: https://projects.blender.org/blender/blender/pulls/120178
85d77b79a6