Rework sourcing of extension scripts on initialisation.
Rework sourcing of extension scripts on initialisation.

nobeans/gvm-cli,shanman190/sdkman-cli,dsyer/gvm,jbovet/gvm,skpal/sdkman-cli,DealerDotCom/gvm-cli,skpal/sdkman-cli,GsusRecovery/sdkman-cli,dsyer/gvm,sdkman/sdkman-cli,busches/gvm-cli,nobeans/gvm-cli,gvmtool/gvm-cli,DealerDotCom/gvm-cli,GsusRecovery/sdkman-cli