Update preloader type in ApplicationMain.hx html5 template.
Update preloader type in ApplicationMain.hx html5 template.

Update the preloader type so when end-users wish to customise the
preloader class they have the choice of extending the existing
NMEPreloader class or writing their own implementation.

haxenme/nme,madrazo/nme,haxenme/nme,haxenme/nme,thomasuster/NME,haxenme/nme,thomasuster/NME,thomasuster/NME,thomasuster/NME,haxenme/nme,thomasuster/NME,thomasuster/NME,madrazo/nme,madrazo/nme,madrazo/nme,madrazo/nme,madrazo/nme