updater: do not lock files in Bootstrap IDEA-CR-41039
updater: do not lock files in Bootstrap IDEA-CR-41039

 - load all dependent JARs to memory thus not locking them on disk
 - correctly handling exceptions in 'main' returning non-zero exit code on any exception

allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community