Fixes for keychain storage. Existing keychain code was baulking at so… #521

Job	Run time
Check for Max SDK	8s
linux-x64-internal-release	13m 55s
macos-x64-internal-release	21m 5s
linux-x64-internal-debug	9m 52s
macos-x64-internal-debug	19m 50s
linux-x64-external-release	10m 10s
macos-x64-external-release	16m 50s
windows-x86-internal-release	16m 11s
windows-x86-internal-debug	18m 12s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
windows-x86-external-release	21m 47s
windows-x64-internal-release	16m 45s
windows-x64-internal-debug	13m 51s
windows-x64-external-release	17m 3s
	3h 15m 39s

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