JS: async/await

[soywiz]

Target JS to ES6 (you can always transpile it with a transpiler)
Use async/await pattern to enable support for synchronous I/O and threads

Partially implementation of #265 (but just for JS)

[intrigus]

Wouldn't it be by far easier to implicitly mark all methods as @JTranscSync and only async methods as JTranscAsync?

[soywiz]

@intrigus Yes, it would be easier. But I wanted two things:

• Allow to mark some functions synchronous to ensure at compile-time
• Validate this before investing time into implementing the implicit marking
• Helps me to detect paths that should be synchronous but that are not so I can rewrite parts when possible

[codecov]

Codecov Report

Merging #274 into master will increase coverage by 0.02%.
The diff coverage is 42.99%.

@@             Coverage Diff              @@
##             master     #274      +/-   ##
============================================
+ Coverage     17.82%   17.85%   +0.02%     
  Complexity      386      386              
============================================
  Files           312      314       +2     
  Lines         20747    20802      +55     
  Branches       4485     4493       +8     
============================================
+ Hits           3699     3714      +15     
- Misses        16369    16405      +36     
- Partials        679      683       +4

Impacted Files	Coverage Δ	Complexity Δ
...sc-rt-core/src/com/jtransc/text/MStringReader.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...re/src/com/jtransc/simd/MutableFloat32x4Utils.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...c-rt-core/src/com/jtransc/lang/JTranscObjects.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...ransc-rt-core/src/com/jtransc/mem/FastMemByte.java	0% <ø> (ø)	0 <0> (ø)	⬇️
jtransc-rt-core/src/com/jtransc/FastMemory.java	19.35% <ø> (ø)	6 <0> (ø)	⬇️
jtransc-rt-core/src/com/jtransc/simd/Simd.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...c-rt-core/src/com/jtransc/simd/Float32x4Utils.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...sc-rt-core/src/com/jtransc/mem/BytesReadAlign.java	0% <ø> (ø)	0 <0> (ø)	⬇️
jtransc-rt-core/src/com/jtransc/mem/BytesRead.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...ansc-rt-core/src/com/jtransc/ds/FastStringMap.java	0% <ø> (ø)	0 <0> (ø)	⬇️
... and 42 more

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