CI: Windows (#1521)

* CI: Windows

Add an MSVC build to CI.

* Windows: _USE_MATH_DEFINES

Fix:
```
error C2065: 'M_PI': undeclared identifier
```

* Windows: no unistd.h

fix:
```
fatal error C1083: Cannot open include file: 'unistd.h':
No such file or directory
```

* Injector: Trivially Copyable only GPU

Only strictly required when we memcopy to accelerator devices.

* Flex: never-interactive

We don't use the interactive mode, so we can save some performance
and address:
```
Parser\wp_parser.lex.cpp(1503,40): error C3861: 'isatty': identifier not found
```

Alternatively, we can include `<io.h>` on Windows.

* MSVC: Vector<Long> != Vector<long>

Fix return and assignment issues with `amrex::Long` != `long`
in `amrex::Vector`.

```
  Particles\MultiParticleContainer.cpp(438,13): error C2440: 'return': cannot convert from 'const amrex::Vector<amrex::Long,std::allocator<__int64>>' to 'amrex::Vector<long,std::allocator<long>>'
  Particles\MultiParticleContainer.cpp(452,94): error C2440: 'initializing': cannot convert from 'amrex::Vector<amrex::Long,std::allocator<__int64>>' to 'amrex::Vector<long,std::allocator<long>>'
  Particles\MultiParticleContainer.cpp(459,60): error C2665: 'amrex::ParallelDescriptor::ReduceLongSum': none of the 6 overloads could convert all the argument types
  Particles\WarpXParticleContainer.cpp(782,51): error C2665: 'amrex::ParallelDescriptor::ReduceLongSum': none of the 6 overloads could convert all the argument types
```

* Windows CI: Parallel Build

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/Particles/WarpXParticleContainer.cpp b/Source/Particles/WarpXParticleContainer.cpp
index 63b1125c2..df39bd250 100644
--- a/Source/Particles/WarpXParticleContainer.cpp
+++ b/Source/Particles/WarpXParticleContainer.cpp
@@ -710,7 +710,7 @@ std::array<Real, 3> WarpXParticleContainer::meanParticleVelocity(bool local) {
     amrex::Real vy_total = 0.0;
     amrex::Real vz_total = 0.0;
 
-    long np_total = 0;
+    amrex::Long np_total = 0;
 
     amrex::Real inv_clight_sq = 1.0/PhysConst::c/PhysConst::c;