When using TRACY_MANUAL_LIFETIME, calling most Tracy functions
before starting the profiler results in an assertion. Notably, even
TracyIsConnected is affected. There is, however, no function to check if
the profiler had already started. This commit adds such a function.
These functions are only defined when -DTRACY_FIBERS is set. However,
the function is declared regardless of this declaration, which seems
like it could lead to obscure linking errors. I haven’t encountered any
of these specifically, but in my case, this distinction makes it more
difficult to produce correctly auto-generated bindings.
