Checking in changes prior to tagging of version 1.17.1.
Fix undefined property
further fix for jsonc extension install
Checking in changes prior to tagging of version 1.17.2.
remove die calls from UrlDownloader
remove unused use statement
remove die call from Tasks/TestTask
remove die call from SelfUpdateCommand
remove die calls from Apxs2PatchTask
remove die call from BuildTask
remove die calls from ConfigureTask
remove die call from ExtractTask
remove die call from InstallTask
remove die call from VariantBuilder +icu, use exception instead
add missing use statement on ExtensionCommand\InstallCommand
add missing use statement on ExtensionCommand\ShowCommand
add missing use statements on Extension\ExtensionManager
fix Build typehint by adding missing use statement on TestTask
remove unused use statements from CleanCommand
remove unused use statement from ExtensionCommand/InstallCommand
remove unused use statements from ShowCommand