Math/Utils - various cleanup and deprecations/moves

There are no known breaking changes.

- Timer
  - Uses standard Math.min/Math.max (it's better 2, 3 items).

- Math
  - Updated documentation
  - Marked various Math functions as deprecated, proxying as appropriate
    - Array-based functions -> ArrayUtils
    - RNG-based functions -> Utils
    - Updated core-usage
    - floor/ceil should not be used (alternatives provided)
  - Altered for some equivalencies
  - Also fixes some assorted issues
  - Marked a few internal functions as private

- Utils
  - Moved polyfills to their own file for better visibility
  - Moved array functions to ArrayUtils and marked proxies as deprecated

- Created Phaser.ArrayUtils for array-related functions

- polyfills moved to their own file
  - Functions given function names
  - Added Math.trunc
Math/Utils - various cleanup and deprecations/moves

- Put in the missing changes..
Math/Utils - various cleanup and deprecations/moves

- And one last before..
Math/Utils - various cleanup and deprecations/moves

- FIX/CHANGE - Math.wrapAngle over radians; it would convert radians to degrees
  - No internal code relies on unexpected the radians-to-degrees behavior

- Moved additional methods over to ArrayUtils, only marked deprecated in Math

- Removed some private annotations; e.g. linear / factorial public, but bernstein / catmullRom still protected

- Marked additional duplicates deprecated; e.g linearValue, angleLimit

- Documentation updates

- Fixed some accidental "Utils.Arrays" usage (oops!)

- Bumped deprecations from 2.1.4 to 2.2.0
Merge pull request #1307 from pnstickne/wip-math-util-cleanup

Math/Utils - various cleanup and deprecations/moves