Improve usability. Re-trial of #7679 with different approach. JIRA issue: CORE-12905 - Add ShellSmallIconSize, ShellLargeIconSize, and ShellIconBPP global variables in iconcache.cpp. - Add SIC_GetMetricsValue, SIC_GetLargeIconSize, SIC_GetSmallIconSize, and SIC_GetIconBPP helper functions in iconcache.cpp. - Load shell icon size from registry key "HKEY_CURRENT_USER\\Control Panel\\Desktop\\WindowMetrics". - Load icon BPP (bits per pixel) from registry. - Fix SIC_Initialize and SIC_LoadIcon functions for icon size. - Fix SHGetFileInfoW function for SHGFI_SHELLICONSIZE flag.