Fix high-shields not intercepting indirect fire shells

[mszabo-wikia]

Changes

#2869 adjusted the collision check used by shields to normalize away the 3D component of positions by default, which in turn caused high-shields to no longer intercept indirect fire shells. Switch these to use spherical collision checking to bring back the old behavior.

References

• Closes [Bug]: Mech high-shield does not intercept mortar rounds #3010

Testing

Check tests you have performed:

• Compiles without warnings
• Game runs without errors
• Playtested a colony -- spawned in a mech cluster with a high-shield, and verified that regular mortar shells now explode upon contact with the shield without dealing damage while EMP shields still break the shield

[mszabo-wikia]

Test save:
mortar.rws.zip

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-11543568159.zip

[N7Huntsman]

Fixes the issue with high shields not intercepting mortars. Though, when they explode, the blasts still appear at ground level, due to how RW handles the explosions. Players could find this somewhat misleading--though I'm not sure what exactly could be done about it.

I've notice that mortar shell shadows now follow and odd-looking parabolic arc (without the shell rotating to "fly" normally), but that's not directly related to this PR.

[MaxDorob]

Looks good

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-11981309583.zip