Fix GAP9 L3->L2 tiling and more

[lukamac]

This PR started as a fix for GAP9's L3->L2 bug but ended up being more.

Added:

• Georg's hack for new onnx export that doesn't have numbers

Changes:

• upgraded pulp-nnx kernel library
• small rewrite of the addition tiler
• moved global static structures to local scope in the ne16 kernel

Fixes:

• broken path to network/main templates