Additional cloak sounds/cloak types

[Blade]

Currently the game is hard coded to use one sound for all unit cloaking events. This works fine for the game as shipped since only submarine type units cloak. However many mods want to add additional stealth ground units and having them sound like a sub submerging gives a less polished impression.

[sansko (sansko)]

i like this one, we need more possibility for cloaking and this is a good addition for the more cloack types issue

[Untrue (untrue)]

Well, I also have an idea about cloaked units. Make cloaked units differ by terrains.

[TechnoType]
CloakedInTile=clear, rough, road, water, tiberium, weeds, beach, ice, railroad, tunnel ; rocks and walls are impassable. Unless if you want air or jumpjet units to cloak on them.
CloakedInOverlay=multiple declarations[OverlayTypes]
CloakedInSmudge=multiple declarations[SmudgeTypes]

It's like making a ninja unit. Making another tag IsNinja=bool would be rendered useless though since we have Cloakable=bool tag.

[Renegade (renegade)]

Closing this one in favor of #bug:525 because the latter went through DFD and thus has had plenty community vetting.