Port all babel-parser changes from 2018-10-01 to 2018-11-09

[alangpierce]

Notably, this adds support for TypeScript 3.0 syntax.

Details:
07862e727 Fix perf issue in typescript parser plugin (#8792)
🚫 Already implemented with a similar fix.

3c8740171 [decorators] [typescript] Parse type parameters (#8767)
✅ Straightforward port.

a5b5ed928 Typescript - Tuple elements can be optional (#8720)
✅ Straightforward port.

2575312d1 Fix parsing of slash after class expression (#8804)
✅ Already worked, added test.

850bc1d3d class private methods and properties: should not allow spaces between # and identifier (#8756)
🚫 Error checking only.

08454ece4 Typescript - Tuples can include rest elements (#8805)
✅ Straightforward port.

d2c75c2d3 fix: corrects handling of newline after async with paren-less arrow function (#8830)
✅ Straightforward port with new regression test.

ce1a6526e flow-bin@0.82.0 (#8832)
🚫 Nothing to port.

8ee857e26 v7.1.3
🚫 Nothing to port.

929567523 Fixes #8865 (#8866)
🚫 Sucrase doesn't maintain curLine.

e4929e11f [flow] Explicit inexact objects with ... (#8884)
✅ Relatively straightforward port with test. No error handling ported.

cd81b079e Allow function types in type params within arrow return types (#8954)
✅ Already worked, just implemented test.

f216a7b06 [flow] Add support for parsing _ as implicit instantiation in call/new (#8883)
✅ Already worked, complexity in the babel code seemed to all be around error
handling.

24c4901ff Remove Babylon plugins for features already merged to the ECMAScript spec (#8448)
🚫 Sucrase doesn't have parser plugins.

e3b2c1aff fix: Do not allow TypeCastExpressions w/o parens (#8956)
🚫 Just extra error handling.

2194842d1 Typescript: Validate tuple type element positions (#8828)
🚫 Just error handling.

2fa198463 Fix await in function name and parameters (#7727)
🚫 Just error handling.

afe67a703 v7.1.5
🚫 Release only.

5d5cd8612 Fix several edge cases with context expression state (#8972)
✅ Added tests, but seems like everything was already working. The fixes were
all around context, and Sucrase got rid of context.

343f776ca Rename primitive types to reserved types (#8984)
🚫 Code doesn't exist in Sucrase.

4f206b241 prettier@1.15.1 (#9001)
🚫 Tooling upgrade.

[codecov-io]

Codecov Report

Merging #333 into master will increase coverage by 0.47%.
The diff coverage is 78.94%.

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
+ Coverage   76.76%   77.24%   +0.47%     
==========================================
  Files          41       41              
  Lines        5281     5299      +18     
  Branches     1280     1286       +6     
==========================================
+ Hits         4054     4093      +39     
+ Misses        850      836      -14     
+ Partials      377      370       -7

Impacted Files	Coverage Δ
src/parser/plugins/typescript.ts	71.1% <100%> (+1.52%)	⬆️
src/parser/traverser/expression.ts	78.92% <50%> (+1.62%)	⬆️
src/parser/plugins/flow.ts	60.81% <50%> (+0.88%)	⬆️
src/parser/traverser/statement.ts	80.98% <75%> (-0.05%)	⬇️
src/parser/tokenizer/readWord.ts	70.97% <0%> (+0.42%)	⬆️
src/parser/tokenizer/index.ts	73.77% <0%> (+0.44%)	⬆️

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