[Bug] Entities with big letters are broken

[MyGamepedia]

Describe the bug Entities with big letters doesn't work with SmartEdit. Attempt to replace an entity with an entity that uses a big letter will cause obsolete. Can be fixed by replacing big letters with small ones in FGD, but this will cause entities that was placed before this change will cause obsolete.

To Reproduce

1. Open FGD and replace a small letter with big letter in classname (or use just FGD that was created for Black Mesa).
2. Open H++.
3. Place entity with big letter.
4. See issues.