GMLTM 0.1.0

• GMLTM1() and GMLTM2() have been removed. Their functionality is fully covered by the priors argument of GMLTM(). See the vignette for equivalent prior specifications.
• Initial release to CRAN.
• Implements LLTM (Fischer, 1973), MLTM-D (Embretson & Yang, 2013), and GMLTM-D (Ramirez et al., 2024) via Bayesian HMC with Stan.
• All models support user-defined prior distributions via the priors argument.
• Includes reliability estimation, posterior predictive checks, and ICC visualization tools.
• Stan backend uses rstan for full CRAN compatibility.