Disable the web platform from being generated by default
Change all VectorX static methods with out VectorX parameters to directly assign the fields rather than constructing new VectorXs.

Vector3.Reflect had the wrong spacing, fixed.
Vector4 must have had wrong line endings, sorry.

Fixes #1611
Merge pull request #2392 from hach-que/disable-web-default

Disable the web platform from being generated by default
Merge pull request #2397 from danzel/fix-1611-vectors

Remove new VectorX usage in static (out VectorX) methods
Merge branch 'develop' of https://github.com/mono/monogame into develop