Xcoll release 0.3.4

What's Changed

• Add crystal loading from Sixtrack colldbs by @chiaramaccani in #61
• Updated examples

Develop Updates

• Adapted kernel attachments following Xtrack release 0.54.1
• Added transfer line test

New Contributors

• @chiaramaccani made their first contribution in #61

Full Changelog: v0.3.3...v0.3.4