RcppXsimd 7.1.6-1

• Remove dependency on C++14

RcppXsimd 7.1.6

• Fixed missing header in Xsimd version 7.1 for compilation under gcc 11
• Added inst/CITATION file

RcppXsimd 7.1.5

• Add support for NEON on Apple M1
• Modify testing on Windows x64 systems

RcppXsimd 7.1.4

• Patch for compilation error on Solaris

RcppXsimd 7.1.3

• Initial CRAN submission