Replaced some C-style casts with Cpp style casts.

[Dimi1010]

Part of #977.

Overview:

• Replaces C-style casts to static_cast where possible.
• Replaces C-style casts to reinterpret_cast where static_cast fails.
• Single instance of a C-style cast being replaced with const_cast as it was used to strip const-ness.
  Added TODO comment as that is a potential access violation. Link

[tigercosmos]

Nice work, thanks!