Adding iOS 12 and Safari 12 (both iOS and macOS) and macOS 10.14

[jaydiablo]

Fixes #1894.

Just a small sample of iOS 12 and Safari 12 UAs so far, but I added what I saw (plus adding iOS 12 to Chrome iOS as I figured that one would show up soon).

Tests added for coverage.

[codecov]

Codecov Report

Merging #1895 into master will decrease coverage by <.01%.
The diff coverage is 44%.

@@             Coverage Diff              @@
##             master    #1895      +/-   ##
============================================
- Coverage      50.1%   50.09%   -0.01%     
  Complexity      905      905              
============================================
  Files          1667     1669       +2     
  Lines         60890    60937      +47     
  Branches      26989    27022      +33     
============================================
+ Hits          30506    30528      +22     
- Misses        30384    30409      +25

Flag	Coverage Δ	Complexity Δ
#full	45.08% <40%> (-0.01%)	0 <0> (ø)
#lite	2.12% <24%> (+0.01%)	0 <0> (ø)	⬇️
#standard	26.61% <22%> (-0.01%)	0 <0> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...ser-agents/browsers/chrome/chrome-ios-generic.json	66.66% <0%> (-3.93%)	0 <0> (ø)
...es/user-agents/browsers/safari/safari-generic.json	36.31% <0%> (ø)	0 <0> (ø)	⬇️
.../browsers/mobile-safari/mobile-safari-generic.json	38.94% <0%> (-3.59%)	0 <0> (ø)
.../user-agents/browsers/chrome/chrome-ios-48-on.json	88.46% <0%> (-7.38%)	0 <0> (ø)
...bile-safari-uiwebview/mobile-safari-uiwebview.json	61.53% <25%> (-1.98%)	0 <0> (ø)
...ser-agents/apps/listia-app/listia-app-generic.json	61.61% <50%> (-0.24%)	0 <0> (ø)
...ources/user-agents/apps/facebook/facebook-app.json	97.04% <50%> (-0.12%)	0 <0> (ø)
...r-agents/apps/facebook/facebook-messenger-app.json	93.57% <50%> (-0.21%)	0 <0> (ø)
...nts/browsers/mobile-safari/mobile-safari-12-0.json	70% <70%> (ø)	0 <0> (?)
...urces/user-agents/browsers/safari/safari-12-0.json	80% <80%> (ø)	0 <0> (?)
... and 2 more

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