chore(menu): Rename SimpleMenu to Menu

[williamernest]

BREAKING CHANGE: Renames MDCSimpleMenu to MDCMenu. Renames all mdc-simple-menu classes to mdc-menu.

[codecov-io]

Codecov Report

Merging #2061 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #2061   +/-   ##
=======================================
  Coverage   99.43%   99.43%           
=======================================
  Files          84       84           
  Lines        3720     3720           
  Branches      485      485           
=======================================
  Hits         3699     3699           
  Misses         21       21

Impacted Files	Coverage Δ
packages/mdc-menu/constants.js	100% <ø> (ø)
packages/mdc-select/foundation.js	100% <ø> (ø)	⬆️
packages/mdc-select/index.js	100% <100%> (ø)	⬆️
packages/mdc-menu/index.js	100% <100%> (ø)
packages/mdc-menu/foundation.js	99.26% <100%> (ø)

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[acdvorak]

LGTM!

In the BREAKING CHANGE message, make sure to also mention that the JS and Sass file paths have changed.

[Kerrick]

This broke the util export from #824

[williamernest]

@Kerrick Thanks for catching this. I'll be adding this back in the new mdc-menu-surface package coming in the next major release.