Rename QSim library to QuaSiMo

Mccaskey, Alexrequested to merge
github/fork/tnguyen-ornl/tnguyen/qsim-rebrand into master

Created by: tnguyen-ornl

  • Rename qsim directory in qcor/lib.

  • Rename the qsim namespace.

  • Rename example and test filenames referring to qsim

  • Updated README, CMake files, etc.

Tested by: rebuilding and running ctest & examples

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