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[cmake] add error and warning if missing submodule
if we're missing the imgui submodule immediately issue a warning that tells us that this is the case instead of proceeding and writing into the non-existant directory. writing into the directory causes the directory to exist, which means that subsequent attempts at updating and cloning the submodule will fail. These changes mitigate this by printing out a relevant error message and halting cmake generation at the earliest possible moment.
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