Make log parameters lazy instead of auto ref.
Make log parameters lazy instead of auto ref.

This enables passing arguments doing complex computations for debug messages without worrying about impacting execution speed when debug logging is disabled.

schuetzm/dub,Flamaros/dub,grogancolin/dub,alexeibs/dub,jeanbaptistelab/dub,nazriel/dub,p0nce/dub,D-Programming-Language/dub,rjframe/dub,Abscissa/dub,Abscissa/dub-data-mod,dreamsxin/dub,gedaiu/dub,xentec/dub,y12uc231/dub,Geod24/dub,jelmansouri/dub