Add engineStreamingFreeUpMemory #2268
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This function is a wrapper around CStreaming::MakeSpaceFor
The downside is that it isn't accurate, at all. The function works more like "try to free up at least this amount of bytes". It usually ends up freeing everything that isn't currently needed (which, depending on the scenery might be 1-200 megs).
EDIT: Turned out I was calling the wrong function. Re-test before merge!
This function will be useful for scripters when #1677 is introduced (along with a function to get the current streaming mem. usage)