Proposals:Architecture related

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This is meant to become a summarized list of all feature requests/suggestions related to improving FlightGear's architecture, it is largely based on Feature Requests / Proposals / Ideas (where all related items were deleted) and may not be up to date with the most recent developments in CVS, your help in updating and maintaining this list is appreciated!

• Meanwhile, FlightGear has become a pretty monolothic piece of software, in the long run it would be desirable if the code could become somewhat more modularized and structured, eventually this should also make it easier for new contributors to get started.
• basically all subsystems should be fully "suspend-able" and "reinit-able" at runtime, there are currently various subsystems that will consume CPU cycles even though they are not in fact necessarily required, affecting FlightGear's performance negatively. This is particularly the case for non-SGSubsystem based systems.
• eventually, it may become desirable to add unit testing support to those FlightGear subsystems/components that can be considered stable and that are thus unlikely to change significantly anytime soon, that way it should become much easier to track development problems early.