lpm functions and hdl

@josyb Yes, I'm aware there's a cost to exposing q_next and having to chose between the convenience of having the result exposed before the clock going high rather than after. Considering this module is used multiple times throughout my design I'm going to have to choose and see which where I want to take a hit. By exposing q_next I get to save additional states in my main state-machine, will has reduced the overall cost, so there's a ripple effect.. The target for my project is a MachXO2 1280 which is tight..

With regards to having multiple 'always' blocks... I've gone through a number of 'style' iterations and kinda settled on the current one. Maybe not the nicest way but I'm sure I'll eventually come down to a more compact one.

Thanks for the comments though! Highly appreciated!

-Mux