* Reorganize namespaces
- Most types are now moved into the `melonDS` namespace
- Only good chance to do this for a while, since a big refactor is next
* Fix the build
* Slight polish to DMA
- Default-initialize members explicitly
- Mark some methods as const noexcept
- Initialize DMA::MRAMBurstTable to DMATiming::MRAMDummy
- Use the default destructor
* Move DMA_Timings definitions to a source file
- To ensure constant and unique addresses
* Include some extra DMA members in the savestate
* Simplify serializing the DMA table
- Extend the dummy table to 256 bytes (same length as the real ones)
* Revert the type change to DMA::DoSavestate
* Keep the MRAMBurstTable inside the DMA class, instead of using a pointer
- If we use a pointer to an external table, then we can't use it in savestates (else that external table gets overwritten)
