Add aliases for IWADs

[satorope]

Like Zdoom, add an alias for IWAD.

iwadinfo.txt
{
	"doom_complete.pk3"
	"doom2.wad"
	"doom2f.wad"
	"plutonia.wad"
	"tnt.wad"
	"doomu.wad"
	"doom.wad"
	"doom1.wad"
	"bfgdoom2.wad"
	"doom2bfg.wad"
	"bfgdoom.wad"
	"doombfg.wad"
	"doomxbox.wad"
	"doom2xbox.wad"
	"doomunity.wad"
	"doom2unity.wad"
	"doom2f.wad"
	"tntunity.wad"
	"plutoniaunity.wad"
	"freedoom1.wad"
	"freedoom2.wad"
	"freedoomu.wad"
	"freedoom.wad"
	"freedm.wad"
	"heretic.wad"
	"hereticsr.wad"
	"heretic1.wad"
	"hexen.wad"
	"hexdd.wad"
	"hexendemo.wad"
	"hexdemo.wad"
	"strife1.wad"
	"sve.wad"
	"strife0.wad"
	"strife.wad"
	"blasphem.wad"
	"blasphemer.wad"
	"chex.wad"
	"chex3.wad"
	"action2.wad"
	"harm1.wad"
	"hacx.wad"
	"hacx2.wad"
	"square1.pk3"
	"delaweare.wad"
	"rotwb.wad"
}