Add skeleton hook directory for RISC OS 4.39
Largely a clone of the RO400Hook. Also * Update RO400Hook/ResetCMOS to have the right OS version at the end * In each 'Desktop' file only Filer_Boot the utilities of the same major version number * BootRun accepts RISC OS Adjust's extra default library prefix, but outputs a corrected Run$Path (where the CSD is checked before the Lib) * Makefile and docs updated Tested on RISC OS 4.39, booting to the desktop with no errors. Version 1.13. Tagged as 'Boot-1_13'
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