Bunch of fixes and changes

[lukamac]

I have been working on adding support for an updated Neureka gvsoc model. Furthermore, I was writing a script that fakes quantization and wanted to use the Generic target for testing it.
This is a collection of small fixes and changes I needed for this. I am creating a pull request now because I'm abandoning the effort in the Generic platform and going straight for the siracusa platform.

Best reviewed commit by commit.

Added

• check for CMAKE variable
• tensor name mangling
• identity operation removal
• _unpack_const helper function to NodeParser to allow for node attributes that are direct Constant tensors or direct numpy values
• load_file_to_local in dory_mem as a way to load values directly to a local memory (not ram). needed for copying values from flash to wmem needed for Neureka v2
• add_gvsoc_v2_emulation macro - changed the naming to reflect that it is the same macro like in pulp-sdk but using a different (standalone) gvsoc, added target argument to it to allow reuse. This might clash with whatever has been cooked in parallel on the topic of standalone gvsoc.

Changed

• duplicateConstants now also duplicate constant nodes
• check float output define in DeeployTest Generic platform
• kernel_shape now inferred from weight shape if not present as per ONNX spec
• USE_NEUREKA moved into TargetLibraries where it's closer to pulp-nnx
• hex dumping logic for pulp platforms in prep for neureka v2 where I need to save weights to flash and move them during runtime to wmem

Fixed

• RequantShift when log2d is 0
• missing math.h headers
• clang on mac doesn't support -Wl,--gc-sections flag, moved it into each target and for host it's checking now for host system
• --ffast-math caused numerical errors on generic so moved into each target and removed from that one since I'm imagining it as the debug target
• Gather kernel on generic target

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