Don't throw exceptions from destructors
Trim whitespace from all of the style fields when parsing. Closes #1565.
Handle filters which unregister themselves in AssExportFilterChain::Clear
Get rid of auto-running exporters, since they aren't really used for anything anymore
Add agi::util::try_parse
Add agi::util::Remove for deleting files
Use CRC32 for ffms2 index filenames

No real advantages other than that it means md5.h/c can be deleted.
Don't write the crash xml file

Nothing uses it and it's not even valid xml.
Add agi::Path for path manipulation and token management
Add filesystem manipulation functions to libaegisub
Add agi::strftime