Attempt to fix Unix support

Fixed window icon in FeatureSelectionDialog.

Added ServerCopyExport tool.

Added minimum version for packages.

Added launch modifier to packages.

Added support for user files and features.

Added system property to load an additional launcher.properties.

Added pretty print option to package builder.

Renamed open folder menu items.

Fixed directory opening.

Indeterminate progress bar for instance list loading.

Added more detection of broken instances.

Catch instance removal failures.

Added "Launcher console" button to config dialog.

Improved handling of broken instances.

Added console log button to ProgressDialog.

Added better handling of failed downloads.

Improved assets expanding, downloader messages.

Better handling of LauncherException in error dialogs.

Added back additional library path.

Fixed incorrect location for install log and version cache.

Made ProgressDialog's progress bar taller.

Allow "Check for updates" to also check for launcher updates.

Rewrote updating mechanism to be more reliable.

Fixed usedHashes not being utilized in Installer.

Force passing of a VersionManifest instance rather than an assets index ID.

Made InstallLog synchronized.

Fixed downloading of assets index.

Fix error in ClientFileCollector.

Skip _OPTIONAL folders in ClientFileCollector.

Made instance name detection case in-sensitive.

Fixed issue with update button always appearing.

Initial commit.