Lots of mecha changes and additions.

- Added constructible Phazon parts and circuits to R&D machines
- Added a Phazon construction path
- Nerfed the Phazon greatly
 > equip slots down to 3 from 4
 > step_in up to 2 from 1
 > toxin punch damage greatly nerfed (from ~80 tox damage to ~20 per hit)
 > research levels required increased (materials 7, bluespace 6, power 6, emp 6, data 5)
 > research levels from parts reduced
- Fluffed out the Phazon in general (sounds, descriptions)

- Grammar fixes to mecha construction process - added a bunch of missing periods and articles
- Changed Durand construction to require a super capacitor and phasic scanner instead of advanced ones

- Buffed the exosuit extinguisher (now has 1000 water instead of 200)
- Buffed the exosuit plasma generator (now consumes fuel at half the speed and doesn't burn through masses of plasma in minutes)
- Moved the cable layer tool from medical_tools.dm to tools.dm (why even)

- Buffed Ripley's default armour (brute from 20% to 40%, bomb protection 80% instead of none)
- All Ripley variants now have the same lights_power 7 (from Default Ripley's 6, and Death Ripley's 60 which basically created a fully lit square around it)
- The default Ripley can now be augmented with goliath armour plates, up to 70% brute protection (plates drop if Ripley is killed)
- Goliath-plated Ripleys get a different sprite and examine-description
Fixes duplicate Ripley proc code, moves messages to switch() in Phazon damtype change code
Removes comments from combat.dm and phazon.dm
I accidentally the phasing
* prevent href exploit with stacks multiplier
used zipcuffs name change
initial commit of assistant antag option
typo and comment fixes in configuration.dm
Remove del-alls list of safes
Removes comment
Fixes the bug with Gygax/Durand armour welding sprites looping infinitely
Adding a CanPass() proc to girders. Projectiles can now sometimes pass through them, with varying percentage chance depending on girder subtypes.

Fixing reinforced and disloged girders being called "reinforced" or "disloged" upon examination instead of "disloged girder" and "reinforced girder".
Adding passtable and passgrille to mice for consistency, because chicks already have those flags.
Href exploit fixing : the bugfree edition
Manage Free Slots

Converts the nearly useless List Free Slots command to Manage Free Slots

From here you can painlessly add and remove job slots to your hearts content because the HoP is Dead/Shit/AFK/In Hiding

It can't be used before round start to make rounds with only clowns because of jobs.txt being applied at round start. Alas.
Removing the fourth argument (air_group) of CanPass() everywhere, because it isn't used anywhere.
Fixing one instance of "for(mob in viewers) show_message()" to "visible_message()"
Merge branch 'master' of https://github.com/tgstation/-tg-station into DisplacedGirderFix

Conflicts:
	code/modules/recycling/disposal.dm
derp
Renames the proc
Adds adminmoreinfo to Syndicate and Centcomm messages
I think this needs a changelog