Added support for very long command lines on update

This release introduces the boolean flag RestoreLongCommandLine that allows to restore long (above 1024 bytes) command lines arguments in case of mandatory updates.

Sample:
<AppInstallerUpdateHandler> <WaitForUpdateSearchToFinish>true</WaitForUpdateSearchToFinish> <TreatAvailableUpdateAsMandatory>true</TreatAvailableUpdateAsMandatory> <RestartOnMandatoryUpdate>true</RestartOnMandatoryUpdate> **<RestoreLongCommandLine>true</RestoreLongCommandLine>** <Message lang="en" caption="AppName Update">AppName needs to install an update. Please wait.</Message> </AppInstallerUpdateHandler>