V5-0 - Add 10mm spacers,replace FMC front panel kit

The standoffs are not in the BOM file "arrangement-mat". They are needed.

Replace the Xtech FMC front panel kit, the two spacers and the four hexalobular screws by the following ELMA kit reference:
21M280-2

The ELMA 21M280-2 kit contains:

- 1 FMC front panel

- 1 O-ring

- 2 10mm spacers
- 8 M2.5x6mm screws