Enable selective use of the C++ allocator #61
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In #50, we didn't make the allocator optional, we made it forbidden. This PR adds a
NO_ALLOCflag that turns off the allocator dependency. If that flag is enabled, we usestd::vectorandstd::mapas normal. If it is enabled, then we use our custom, fixed-size vector/map implementations.The main note of caution here is that we inherit from STL containers. This is fine within the scope of this library, but can cause memory leaks in certain other situations.