Fix Compiler Warnings - Zero Hour + Tools - Level 2 warnings

[Mauller]

Related to #482 as a sub task.

Dependent on #503 being completed first to decrease number of warnings shown.

Fix all level 2 compiler warnings in Zero Hour + Tools for the Vs22 build.

Only Fix warnings that won't change behaviour or break VC6 compatability.

[Mauller]

Starting a Comment here with warnings that won't get changes in this first pass that could lead to changes in behaviour, will keep it updated as new things appear.

File - Line - Bug - Info

[ZH] BuddyThread.cpp - 363 - Fallthrough in Switch case - BUDDYREQUEST_DENYADD is missing a break and will fall into BUDDYREQUEST_SETSTATUS
[ZH] LookAtXlat.cpp - 374 - Fallthrough in Switch case - MSG_RAW_MOUSE_WHEEL falls into MSG_META_OPTIONS but has a comment stating this should happen, it would be safer to just call "stopScrolling()" at the end of MSG_RAW_MOUSE_WHEEL

[ZH] PeerThread.cpp - 189 - Uninitialsed Variables - PeerThreadClass constructor only partialy initialises the object.
[ZH] registry.cpp - 25 - Macro Redefinition - WIN32_LEAN_AND_MEAN is considered redefined.

[ZH] ControlBar.h - 481->486 - Missing Function Definitions - Destructor, init, reset, update and draw functions all lack bodies.
[ZH] ControlBar.h - 452 - Uninitialised Variables - Constructor only partially initialises the object.

[ZH] PeerThread.h - 46->174 - Uninitialised Varaibles - PeerRequest class contains structs with uninitialised variables.

[ZH] FlightDeckBehavior.cpp - 198 - Discarding return value - return value from iterator is ignored
[ZH] FlightDeckBehavior.cpp - 1360 - Null pointer dereference - no guard against null pointer dereferencing
[ZH] FlightDeckBehavior.cpp - 61 - Uninitialised Variables - FlightDeckBehaviorModuleData constructor only partially initialised the object.

[Mauller]

The only warnings that can be fixed at Level 2 are enumerations that were made static by someone, they were likely thinking it would make them internal to the compilation unit. But that is not what static means in C++ compared to C.

So i will move those fixes into level 3 warnings.