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Since vector resize can cause pointers into the vector to become
invalid, this patch introduces a level of indirection for DMAs and
Scratchs, using uuid on the user-side of a request to index into the
request vector.

Refactor the DMA API to work on layouts internally. The resulting code
ends up simpler for most cases, as long as we add a generic copy
function.

One things missing:
- a good API to expose the collection of copy functions we have.

One question not solved:
- should the DMA ask for a copy function on each operation ?

Removes static allocations of all objects from the library.
While this will make our code less compact in theory,
this part of the API is too confusing for new users.

Also create the basic page structure, including importing the doxygen
API documentation through breathe.

Also fix some doxygen config, as doxygen wasn't generating scratchpad
info, and the dma implementation groups had a different name that the
structs.

Implement #31 for dma.
Improve error management.
Checkpatch dma

Fixes #16.

Poorly supported feature that doesn't play well with the rest of the
library and limits what we can do in the future.

The overall strategy for now is to split the implementations into
distinct headers, but keep the generic APIs inside the main aml.h

Related to #27