Compiler only guarantees proper accesses to variables when using
variable's native type or `char` (i.e. single byte type) [1].
This commit fixes violations of this rule. In most cases changing code
to a simple cast was enough, some required a bit deeper modifications.
This fixes#2596.
[1] http://blog.qt.io/blog/2011/06/10/type-punning-and-strict-aliasing/
Step 1 on road towards Linux.
Remove windows-specific code, stub it out where needed and make sure we
can still compile it the way it is.
Take care of Travis' build matrix to include new build configuration.
Install new packages.
