PHP 7.1 Optimisations

[Silic0nS0ldier]

There are numerous performance and usability improvements that simply were not possible under PHP 5.6. As we look ahead to UF 4.3 the hope is that this PR will serve as a spring board, so that when 4.2 stable is out we can hit the ground running.

Changes include;

• Increasing the minimum PHP version defined in composer.json.
• Removing PHP versions 5.6 and 7 from the Travis build matrix.
• Avoiding usage of ClassMapper->staticMethod in favour of working directly with the returned class name.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@fc00e07). Click here to learn what that means.
The diff coverage is 20.58%.

@@            Coverage Diff             @@
##             develop     #937   +/-   ##
==========================================
  Coverage           ?   35.53%           
  Complexity         ?     2059           
==========================================
  Files              ?      158           
  Lines              ?     6982           
  Branches           ?        0           
==========================================
  Hits               ?     2481           
  Misses             ?     4501           
  Partials           ?        0

Impacted Files	Coverage Δ	Complexity Δ
app/sprinkles/core/src/Throttle/Throttler.php	27.45% <0%> (ø)	21 <0> (?)
...sprinkles/admin/src/Controller/GroupController.php	0% <0%> (ø)	61 <0> (?)
.../sprinkles/admin/src/Controller/UserController.php	0% <0%> (ø)	112 <0> (?)
...kles/admin/src/Controller/PermissionController.php	0% <0%> (ø)	12 <0> (?)
...nkles/account/src/Controller/AccountController.php	0% <0%> (ø)	85 <0> (?)
...rinkles/account/src/Repository/TokenRepository.php	0% <0%> (ø)	14 <0> (?)
app/sprinkles/account/src/Database/Models/User.php	50.89% <0%> (ø)	35 <0> (?)
...inkles/admin/src/Sprunje/PermissionUserSprunje.php	0% <0%> (ø)	3 <0> (?)
.../sprinkles/admin/src/Controller/RoleController.php	0% <0%> (ø)	80 <0> (?)
app/sprinkles/account/src/Util/Util.php	0% <0%> (ø)	4 <0> (?)
... and 5 more

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