Big update to the ISTA-P pack

• Added full original installers for several ISTA-P integration levels:
  
  • BMW_ISPI_ISTA-P_DAT_3.72.0.300.istap + BMW_ISPI_ISTA-P_SYS_3.72.0.300.exe
    
  • BMW_ISPI_ISTA-P_DAT_3.73.0.100.7z + BMW_ISPI_ISTA-P_SYS_3.73.0.100.7z
    
  • BDRClientData_73.0.200.istap + BMW_ISPI_ISTA-P_BDRClient_3.73.0.200.exe
    
• Included optional ready-made offline build:
  
  • ISTA-P 72.0.300 StandAlone.7z – standalone package for local workshop use.
    
• Bundled a complete ISTA-P Loader collection for ICOM, K+DCAN and ENET:
  
  • Loader 4.3 (ICOM emulator for K+DCAN & ENET)
    
  • Loader 6.0F, 6.1F, 6.2L, 6.3 / 6.3L (incl. Lite build), 6.4 / 6.4L and 6.6L
    
  • Activation keys, configuration PDFs and screenshots for each major loader version
    
• Reworked description to clearly explain the difference between installers, StandAlone build and loaders, plus how they relate to ICOM / K+DCAN / ENET setups.
• Added new screenshots showing expert mode, ICOM emulator, ZGW IP search and ENET network configuration.
• Minor clean-up of folder structure and extra safety notes for programming (stable power, proper interface, use at your own risk).