v47 with smaller headers and non-experimental coroutines

January 1, 2024

v47 brings support for coroutines out of experimental status, and a header reorganization which can help reduce build times.

Coroutines are conditionally supported by the __cpp_impl_coroutine feature test macro. There is no longer any need to define the TROMPELOEIL_EXPERIMENTAL_COROUTINES macro in order to use coroutines with Trompeloeil.
Split the monolithic "trompeloeil.hpp" into several smaller headers. You can continue to #include <trompeloeil.hpp> as usual, but you can also do more fine-grained #include, which may improve build times. E.g.:
```
#include <trompeloeil/mock.hpp> // basic mock functionality
#include <trompeloeil/lifetime.hpp> // REQUIRE_DESTRUCTION etc.
#include <trompeloeil/matcher/re.hpp> // regular expressions
```
The reference manual says which header to include to get the functionality for each item. If no header is mentioned, it is in <trompeleil/mock.hpp>