A few implementations of Render() contain const-casts nested within its
their call hierarchy to get around the fact that this function is marked
const. We can just make the member function non-const to allow removal
of these casts in follow up changes.
This member function alters instance state in a few implementations, so
it shouldn't be made const.
The state manager parameter also shouldn't be const. Retrieved data
from the post constructed instance is further modified in some
implementations. This removes the constness on this parameter in order
to fix more const_cast usages in a follow-up change.
In some implementations, returning via default construction for
std::optional can cause the entire inner buffer to be zeroed out.
Returning with std::nullopt causes only the internal validity flag to be
set and nothing more.
Like the prior changes normalizing the inclusions within headers, this
tackles the cpp files of the RuntimeCommonB target, making these source
files consistent with their headers.
