Marlin UMO Unified

### _Unified_ build environment for UMO / UMO with HBK / UMO+

Since there are very few changes between the 3 variants of UMO, I have consolidated all three versions in the same source tree, so that everything can be done in one place.

UMO flavor selection is done either in  Configuration.h directly or directly from the command line at compile time (See _do_make_xxx.bat files)

There is also a _do_make.sh bash script for Linux/OSX systems. 

**Testing**: the original source tree and the _unified_ one are generating the exact same firmware (Using a 'fixed date', as the compile time is in the firmware!)
Checksums:
```
31651 315 Ultimaker-Marlin/Marlin/MarlinUltimaker-115200-dual.hex
31651 315 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-115200-dual.hex
12074 302 Ultimaker-Marlin/Marlin/MarlinUltimaker-115200.hex
12074 302 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-115200.hex
43396 315 Ultimaker-Marlin/Marlin/MarlinUltimaker-250000-dual.hex
43396 315 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-250000-dual.hex
40717 302 Ultimaker-Marlin/Marlin/MarlinUltimaker-250000.hex
40717 302 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-250000.hex
33881 323 Ultimaker-Marlin/Marlin/MarlinUltimaker-HBK-115200-dual.hex
33881 323 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-HBK-115200-dual.hex
39494 313 Ultimaker-Marlin/Marlin/MarlinUltimaker-HBK-115200.hex
39494 313 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-HBK-115200.hex
1885 323 Ultimaker-Marlin/Marlin/MarlinUltimaker-HBK-250000-dual.hex
1885 323 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-HBK-250000-dual.hex
2953 313 Ultimaker-Marlin/Marlin/MarlinUltimaker-HBK-250000.hex
2953 313 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-HBK-250000.hex
62294 318 Ultimaker-Marlin/Marlin/MarlinUltimaker-UMOP-115200-dual.hex
62294 318 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-UMOP-115200-dual.hex
58833 308 Ultimaker-Marlin/Marlin/MarlinUltimaker-UMOP-115200.hex
58833 308 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-UMOP-115200.hex
63810 318 Ultimaker-Marlin/Marlin/MarlinUltimaker-UMOP-250000-dual.hex
63810 318 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-UMOP-250000-dual.hex
53146 308 Ultimaker-Marlin/Marlin/MarlinUltimaker-UMOP-250000.hex
53146 308 AmedeeBulle-Marlin/Marlin/MarlinUltimaker-UMOP-250000.hex
```