Refactored token dictionary loading and encapsulated dictionary

fix imports mtl/eval_utils

comment out "def save_model_without_heads(original_model_save_directory)"; redundant for ISP/Emb extractor (#382)

fixed bug related to dynamic ranges in dictionary with 'min' and 'max' value mismatch in optuna suggest fn (#380)

precommit formatting

update with 12L and 20L i4096 gc95M models, multitask and quantiz code