Add interface for SMM/GMM

Add commands gmm_estimation and smm_estimation modelled like prior_function/posterior_function-commands. Syntax should be a. Command gmm_estimation(options_list) var_list_ translating to [M_,oo_,estim_params_,bayestopt_,dataset_,dataset_info]=GMM_SMM_estimation_core(var_list_,M_,options_,oo_,estim_params_,bayestopt_,dataset_,dataset_info,'GMM'); where var_list_ is the list of variables provided. The command smm_estimation(options_list) should lead to the same output, but with the last string being 'SMM'
The options_list should share the following options with estimation

datafile
silent_optimizer
dirname
xls_sheet
xls_range
nobs
first_obs
loglinear
logdata
nograph
graph_format
mode_file
huge_number
optim
tex
solve_algo
aim_solver
irf
irf_shocks
irf_plot_threshold
qz_zero_threshold

GMM/SMM common options written to different subfields of options_.smm or options_.gmm (depending on the respective command)

order translating to options_.gmm.order
centered_moments translating to options_.gmm.centeredmoments
verbose translating to options_.gmm.verbose
autolag translating to options_.gmm.autolag
recursive_order_estimation translating to options_.gmm.recursive_estimation
mode_compute translating to options_.gmm.mode_compute
newey_west_bandwith translating to options_.gmm.qLag
optimal_weighting_matrix translating to options_.gmm.optimal_weighting
use_prior translating to options_.gmm.use_prior

Additional options for smm_estimation only, written to options_.smm:

simulation_multiple translating to options_.smm.simulation_multiple
smm_drop translating to options_.smm.drop
seed translating to options_.smm.seed
bounded_support translating to options_.smm.bounded_support

New options to estimation, stoch_simul, and gmm_estimation/smm_estimation

analytical_GIRF translating to options_.irf_opt.generalized_irf
IRF_in_percent translating to options_.irf_opt.percent
EMAS_GIRF translating to options_.irf_opt.ergodic_mean_irf
EMAS_drop translating to options_.irf_opt.EM.drop
EMAS_tolf_ translating to options_.irf_opt.EM.tolf
EMAS_max_iter translating to options_.irf_opt.EM.iter