Little bug fixes and improvements

Happy Sunday everybody. Here are some bug fixes and tweaks.

• Following some safety complaints, the drowning pool in the center of the Pan-American Exposition has been converted to a wading pool.

• Fixed some issues relating to water rendering in different lighting scenarios.

• Illumination on health pickup flasks now responds consistently to player damaged state.

• Pyler should always have one head now.

• Fixed some incorrect geometry/collision data in the Railroad Station level.

• Adjusted load zones in Railroad Station to reduce pop-in.

• Changed materials for 3D HUD elements to be more consistent in different lighting scenarios.

Thank you to everyone who has been giving feedback and reporting bugs. If you find more bugs, please . . . let me know. I have to go eat now. Bye.