Improve binary read/write for code readability

[ggutierrez-sunbright]

There's a good opportunity to make the code more readable when it comes to serialization/deserialization of many classes (like grids, file source/sinks, coords, etc).

currently, the code looks like this:
Rbt::WriteWithThrow(ostr, (const char*)&m_NX, sizeof(m_NX));

improvements:

1. we should replace this (const char*) casting with a reinterpret_cast
2. encapsulate all this within a templated function
3. explicitly set the flags for ostream right after instantiation to automatically raise an exception in case an operation fails(ostr.exceptions(...))