Lots of new stuff

• Various bug fixes and refactorings
• Adapted to changes to FortranCallGraph v1.1.0
• Adapted to changes to serialbox-ftg v0.4.0

Requires FortranCallGraph v1.1.x and serialbox-ftg v.0.4.x!

First Release

v1.0.0

Changed serialbox to serialbox-ftg in README.md