Code cleanup and factorization

• Factorize find_path and find_library by creating morse_find_{path,library} that have the Morse wanted behavior
  1. Look inside PROJECT_{LIB,INC}DIR
  2. Look inside PROJECT_DIR/{include,lib}
  3. Look into the system
• Add MORSE_ENABLE_{INCLUDE,LIBRARY}_ENV options to automatically extend:
  1. CMAKE_INCLUDE_PREFIX with environment variables:
     • INCLUDE on Windows
     • INCLUDE, C_INCLUDE_PATH, CPATH, INCLUDE_PATH on other systems
  2. CMAKE_LIBRARY_PREFIX with environment variables:
     • LIBRARY_PATH, LIB on Windows
     • LIBRARY_PATH, DYLD_LIBRARY_PATH on MacOS
     • LIBRARY_PATH, LD_LIBRARY_PATH on Linux
• Update all non pkg-config based detection to use these new functions
• Fix issue with BLAS/LAPACK failed multi-threaded detection that induced a failed BLAS/LAPACK detection even if SEQ version was found
• Factorize CBLAS, TMG, and LAPACKE detection and make sur they use the correct underlying BLAS/LAPACK library