How to correctly add engine feature

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Compile Time Macro

compile time macro can enable/disable your code during preprocess stage

for features only affect some platform, e.g. integrate some non-cross platform libraries. created some overhead if compiled to other platform not using this library.
completely disable a feature

config file is loaded on game startup

preinit some cases scalbility,

Dynamic Switch is is this feature enabled by default(editor/game mode) or only enabled in some case. don’t forget to refresh some cached states

new features apply on game object

how to control priority of object property and console variable