ErrorReporter refactored to use new File API
Remove libarchive support (was disabled)
Remove some deprecated functions
Remove old file API from PluginVst2x

As an added bonus, MrsWatson now understands relative paths
automatically!
Remove more deprecated functions from FileUtilities
Migrate PluginPreset to new File API
Remove old FileUtilities calls from test runner
Move getFileBasename to private static in TestRunner
Migrate MidiSource to new File API
Remove FileUtilities from project

Fixes #190