[IMPROVEMENT] Score rendering

[markusweigelt]

• Switch Verovio to the wasm implementation → performance issue resolved (together with Daniel Röwenstrunk)
• Move the measure-building function call to after adding the score → timeout issues that occurred with large scores are now properly handled
• Improve height and width options to visualize the whole score in both portrait and landscape modes
• Adjust PDF rendering and take page orientation into account
• Fix a null pointer exception in file selection