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, 4 insertions, 4 deletions

diff --git a/Source/Particles/MultiParticleContainer.cpp b/Source/Particles/MultiParticleContainer.cpp
index cc274655d..2b1f310b0 100644
--- a/Source/Particles/MultiParticleContainer.cpp
+++ b/Source/Particles/MultiParticleContainer.cpp
@@ -429,7 +429,7 @@ MultiParticleContainer::ApplyBoundaryConditions ()
     }
 }
 
-Vector<long>
+Vector<Long>
 MultiParticleContainer::GetZeroParticlesInGrid (const int lev) const
 {
     WarpX& warpx = WarpX::GetInstance();
@@ -438,18 +438,18 @@ MultiParticleContainer::GetZeroParticlesInGrid (const int lev) const
     return r;
 }
 
-Vector<long>
+Vector<Long>
 MultiParticleContainer::NumberOfParticlesInGrid (int lev) const
 {
     if (allcontainers.size() == 0)
     {
-        const Vector<long> r = GetZeroParticlesInGrid(lev);
+        const Vector<Long> r = GetZeroParticlesInGrid(lev);
         return r;
     }
     else
     {
         const bool only_valid=true, only_local=true;
-        Vector<long> r = allcontainers[0]->NumberOfParticlesInGrid(lev,only_valid,only_local);
+        Vector<Long> r = allcontainers[0]->NumberOfParticlesInGrid(lev,only_valid,only_local);
         for (unsigned i = 1, n = allcontainers.size(); i < n; ++i) {
             const auto& ri = allcontainers[i]->NumberOfParticlesInGrid(lev,only_valid,only_local);
             for (unsigned j=0, m=ri.size(); j<m; ++j) {