* Add ride groups
* Convert ride groups to C++
* Fix linking and crashes in Xcode
* Comment out .field syntax to make Visual Studio happy
* Fix alignment, fix changelog, cleanup
* Properly save ride group index in the ride object repository and bump its version
* Fix fallback behaviour when the ride entry is not available or not invented
* Fix include
* Rename RideGroup to RideGroupManager, add const, cleanup
* Break after finding matching ride group
Caused by the user not having the required 'official' objects. This was because the network was being closed during a network update. Disposed memory would then be accessed later in the update loop.
To fix this, a lock has been added to Close() so that it can be deferred to the end of Update(). This isn't particularly nice, but the whole of network will need redesigning to fix this properly for all potentical scenarios where Close() can be called.
