IFC merge interface
Uploaded files will be merged in one file with following conditions :
- All data are placed in one project
- All sites are removed from structure
- Each file has its own site
- Each building has its own ifc id
- Each building is named by file (regex first number i.e. "701" ot of "SL_701_ASC_R_RDS_BIM_000-01_01.ifc")