Energy/Laser guns display their charge and how many shots they have l…

…eft on examine (shiptest-ss13#3100)

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Energy weapons now show on examine how much charge they have, or if they
have a cell installed or not. They also show how many shots they have
left on the current fire mode.

Also changes all the span classes to marcos

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QOL change, while it is true you have the charge indicator on the
sprite, it's not the most reliable or accurate. This makes it a lot
easier to keep track of how many shots you have left.

I also often see people try to charge guns with no cells and wonder why
it doesnt work, so some extra textual indication couldnt hurt.

:cl:
add: Energy guns show how much charge and shots they have remaining, or
if it doesnt have a cell installed on examine.
code: span classes to span macros for energy.dm
/:cl:

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