Straight-shot projectile

Registered by AetherDawn

It's really shame that a famous RTS engine doesn't have a proper working straight travelling projectile.
Actually, the engine has part of that logic which was left over from RA1.
In RA1, the straight-shot is the defaut projectile type. In TS, gravity effect was added to make use only for OrcaBomber.
In RA2, when Gravity=0, the default projectile actually works perfectly in most case, only with some issue need to fix.
Now there are two main obstacles in the way.
1.Gravity.
Default projectile with gravity is not useful, so gravity effect should be removed.

2. When fire at building from higher elevation(or from air), the target altitude is wrong.
some test result:
Building Height=0, altitude=0 : target altitude: 0 (perfect case)
Building Height=4, altitude=0 : target altitude: 4 (aim at building's roof)
Building Height=0, altitude=8 : target altitude: 0 (into ground)
Building Height=4, altitude=8 : target altitude: 4 (into ground)
It uses building's Height= value instead of building's current altitude. Looks like another stupid mistake...

With these two issue fixed, we will have a good enough straight-shot projectile type which can greatly improve the combat performance.

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