Robin Gareus c8ddfd5637 Fix C++ memory layout for the TempoMap
Usually C++ class instance has the same mem address as its first parent.
LuaBridge uses this to for derived classes. A TemopPoint instance has
the same address as its parent Tempo. However due to virtual inheritance
this was not the case due to a lack of virtual d'tor.

Now the following Lua code works correctly
```
tm = Temporal.TempoMap.read()
tp = Temporal.timepos_t (0)
print (tm:tempo_at(tp):note_type())
```

Previously the last line failed calling Tempo::note_type()
on a TempoPoint instance, due to memory offset e.g.
TempoPoint: 0x600000ff90e0 Tempo: 0x600000ff90e8
2022-09-28 04:12:11 +02:00
2022-04-08 19:51:02 +02:00
2022-04-08 19:51:02 +02:00
2020-10-18 17:45:32 +02:00
2020-07-06 21:36:12 +02:00
2021-03-23 23:27:45 +01:00

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