feat(LocallyNameless): FullBetaEta, Normal.sup_iff - #862
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1. The old multi-step lemmas redex_app_l_cong and redex_app_r_cong become single-step: step_app_l_cong / step_app_r_cong multi-step: steps_app_l_cong / steps_app_r_cong 2. new theorems: Normal.sup_iff step_fv steps_fv step_subst_cong_l steps_subst_cong_l
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redex_app_l_cong and redex_app_r_cong
become
single-step: step_app_l_cong / step_app_r_cong
multi-step: steps_app_l_cong / steps_app_r_cong
Normal.sup_iff
step_fv
steps_fv
step_subst_cong_l
steps_subst_cong_l