Changes

Soft-deprecate reflection helpers

This commit adds warnings to methods that are likely to be removed in a future version.
The reason these weren't just out-right removed as usual is because: (1) these methods are used frequently, and (2) at this time, their functionality is as desired.
The moment this project switches to JPMS modules, however, it is very possible that these methods will cease to function as their callers had expected. At that point, they will be removed to further improve security.
 (commit: a11a57e)