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from all .cpp and .h files.

'const char*' by passing it straight to the std::string constructor rather than
through a reinterpret_cast.  This solves segfaults when trying to use the OpenMM
C-API (which is auto-generated from the generate*Wrappers.py scripts) when used
with gcc/g++.  clang and clang++ seem to accept this (perhaps why it was not
caught before).

After these changes, the OpenMM-Tinker binding works again with the current git
version of OpenMM.

Plugins work with CPU platform.  This involved separating the reference implementations of plugins into their own libraries.

Separated hardware query functions into a separate file.  CPU platform checks for the correct hardware.