Added continuous integration using github workflows
Makes sure R CMD check runs fine
Added benchmarking script
Make documentation consistent, put the commented examples which were in 0.1 code as examples in the functions + add example datasets of settings as datasets in the package
Split up simon2stage in calculation and plotting
Added speedier variant of
fleming1stage, using Rcpp - speedup x17
addded fleming1stage_multiple which uses this speedup and make calling the function for several settings more easy
exact1stage, using Rcpp - speedup x40
added exact1stage_multiple which uses this speedup and make calling the function for several settings more easy
sargent1stage, using Rcpp - speedup 14% due to use of sargent1stage_N_r_s
sargent1stage uses this speedup and make calling the function for several settings more easy
simon2stage, using lookup - speedup x4
sargent2stage, using lookup similar as simon2stage - speedup x4