We keep track of device, i.e. distinct dive computers with id in the core.
The corresponding code stuck out like a sore thumb. Firstly, because it
is C++. But more importantly, because it used inconsistent nameing conventions.
Notably it defined a "DiveComputerNode" when this is something very different
from "struct dive_computer", the latter being the dive-computer related
data of a single dive.
Since the whole thing is defined in "device.h" and the function to create
such an entry is called "create_device_node", call the structure "device".
Use snake_case for consistency with the other core structures.
Moreover, call the collection of devices "device_table" in analogy
with "dive_table", etc.
Overall, this should make the core code more consistent style-wise.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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