v2.0 RC5

This is the fifth release candidate of the 2.0 series, aiming for a 2.0 stable release.
See the readme for release information, and changelog.txt file for detailed changes.

Changes in this release:
-SBS: added pointer safety checks to elevator car's Loop() function
-VM: SwitchEngines() function should not switch to engines in a paused state
-GUI: added a Paused checkbox to the Engine Manager, to pause/suspend sim engines
-VM: added support for pausing/suspending sim engines
-SBS: added a force mode to movement and set position functions, currently used by Floor objects. Force mode allows objects to pass outside of the simulator engine boundaries.
-SBS: added GetCenter() function, which returns the position of the bounds center
-PolyMesh: CreateWallBox() and AddPolygon() functions should report and exit if attempting to create an object outside of the sim engine boundaries
-PolyMesh: if attempting to create walls/floors outside of the engine bounds, only report if specified.
-SBS: fixed an issue with call stations not appearing on sim engines that have off-cener bounds, the call station needs to be moved to a position within the engine bounds before creating walls
-SBS: added GetAreaTrigger() function
-SBS: rewrote a trigger IsOutside() function and added a variant of IsInside()
-SBS: prevent movement and setposition outside of sim engine boundaries
-PolyMesh: report an error if attempting to create a wall outside of engine boundaries
-PolyMesh: DynamicMesh should report as itself
-SBS: Abort DynamicMesh mesh creation if provided scenenode doesn't exist. This avoids a crash if there's an issue with the scenenode.
-GUI: resized text boxes in Engine Manager window
-GUI: updated Object Info sizing
-SBS: added object IsEnabled() function support to remaining objects
-GUI: added "Is Movable" and Enabled checkbox to Object Info window, the checkbox still needs an IsEnabled() implementation from Object in SBS
-GUI: resized the Move Object window's coordinates display boxes
-GUI: sound manager crash fixes, for when sound is disabled
-SBS: fixed an array index issue in Escalator's CreateSteps() function
-SBS: fixed an out-of-bounds write in elevator door's AddServicedFloor() function
-SBS: Fix CreateButtonPanel() function declaration
-SBS: added pointer safety checks to GetFloorNumber() function
-SBS: updated banner to reflect new license file name
-SBS: only print memory report on startup when in verbose mode
-PolyMesh: code cleanups and safety checks for Wall object
-PolyMesh: move wall initialization code into wall object constructor
-HAL: Use size_t for renderer name processing
-VM: when cleaning up empty engine slots, make sure engine count is greater than 0
-HAL: clean up filtermode code
-SBS: remade CreateSky() function, this fixes the old sky system
-Some initialization fixes for the old skybox system
-SBS: shaft and stairwell objects should not use the mesh as their parent, use the shaft/stairwell level instead. Fixes some crashes.
-ScriptProc: fix parameter handling of AddShaftTrigger command
-GUI: check sound handle before access, to prevent a crash
-SBS: re-enabled AddShaftTrigger and AddStairsTrigger commands; they should perform more efficiently due to recent engine code modernization
-VM: simplify display output of ListPlayingSounds() function
-Guide: added SBS page
-Guide: added "Starting Skyscraper" page
-ScriptProc: added side tiling and name parameters to AddExternalDoor command
-ScriptProc: added name parameters to door commands
-ScriptProc: added side tiling parameters to AddStairsDoor and AddDoor commands
-ScriptProc: fixed side tiling parameters of AddShaftStdDoor command
-SBS: moved some system functions into Utility object
-added user's guide page on VR support
-SBS: add texture override support to AddPolygon function, which allows texture overrides to work in the AddPolygon, AddCustomWall, AddCustomFloor, and AddTriangleWall commands