[Bugfix]: Save/load camera data with packet, fix incorrect camera yaw/pitch/roll on load

Created by: yohjimane

Description:

Camera yaw/pitch/roll can be incorrect when loading a save.

Bug repro steps:

1. Load new game
2. Look all the way up
3. Save game
4. check cam_Active()->pitch evaluates to -1.5 (which is within limits. 1.5 = looking down, -1.5 = looking up)
5. Load game from step 3
6. Observe with breakpoint in CameraBase.h line 79: cam_Active()->pitch is set to value of o_torso (evaluates to ~4.865). This value is both incorrect, and invalid for pitch, as pitch values must be between -1.5 to 1.5.

Notes:

This bug is present, but does not cause any direct problems (that i can notice) in latest OpenXray dev build (429519f).

I found this bug while working on some hud inertia logic for my subproject, where some logic dependent on camera yaw value would get messed up after reloading a save while looking upwards.

Solution:

The bug is fixed by using packet to save and load camera yaw/pitch/roll. Now, we only initialize yaw/pitch/roll values from CSE_ALifeCreatureAbstract::o_torso when packet data is missing.

Initializing values from CSE_ALifeCreatureAbstract::o_torso is necessary for correct camera orientation when loading into new levels.

Unfortunately this approach will make save files incompatible.