Cleanup terran units file

[speed2CZ]

Some clean up + fix for UEF factory build arms

[aeoncleanse]

Please confirm you have checked that the UEF Mexes A: Definitely have animations for all stages of upgrade and B: Removing this definitely doesn't cause visual errors.

[speed2CZ]

My quick check confirms that mexes do upgrade normally. The rest of testing is up to the test teeam

[shalkya]

visually seems fine although i got this error that i had on version without the fix too.

WARNING: Error running OnPaused script in Entity ueb0302 at 1b6d2e08: ...documents\github\fa\units\ueb0302\ueb0302_script.lua(59): attempt to call method `SetGoal' (a nil value)
         stack traceback:
         	...documents\github\fa\units\ueb0302\ueb0302_script.lua(59): in function `StopArmsMoving'
         	...s\%USER%\documents\github\fa\lua\terranunits.lua(63): in function <...s\%USER%\documents\github\fa\lua\terranunits.lua:61>

WARNING: Error running OnPaused script in Entity zeb9602 at 21501b08: ...documents\github\fa\units\zeb9602\zeb9602_script.lua(59): attempt to call method `SetGoal' (a nil value)
         stack traceback:
         	...documents\github\fa\units\zeb9602\zeb9602_script.lua(59): in function `StopArmsMoving'
         	...s\%USER%\documents\github\fa\lua\terranunits.lua(63): in function <...s\%USER%\documents\github\fa\lua\terranunits.lua:61>

[speed2CZ]

Those warnings are form the unit scripts, unrelated to this PR. Make a new issue for those please.