Refactor code to get layer info from correct version file
Refactor code to get layer info from correct version file

Does not send_recieve_meta info anymore with keras version.
Instead, it uses skip_layers from the common file.
Then, checks the keras verion and either imports
keras_v1_layer_converters or keras_v2_layer_converters.
Backend is still a global variable that gets passed to layer file.

jwsmithers/lwtnn,lwtnn/lwtnn,jwsmithers/lwtnn,lwtnn/lwtnn,jwsmithers/lwtnn,lwtnn/lwtnn