Remove crate in non-mazing mode?

[dvdlesher]

I don't know if this is just me, but I keep accidentally building crate in non-mazing mode, so this kinda bugs me... (The reason is, the crate and cannon from WC3 eletd has same hotkey)

And... it's redundant to have crate in non-mazing mode in the first place, isn't it?

Oh, and maybe add some quick guide about hero mode as well in F12 menu, perhaps? Just sayin'

[holepercent]

There's a use for crates in non-mazing: to reserve tower spaces in team mode.