Rework Tick Lookup mechanism for cursor placement and highlighting.

[Danielku15]

Issues

Fixes #1281

Proposed changes

This PR reworks largely how the MidiTickLookup works internally.

• We slice now differently the masterbars into sections where one or multiple beats are played.
• Within this new slices we then try to lookup based on a given tick and hint the positions.

For the sake of stability I didn't attempt any code level optimizations but kept the code rather readable.

Checklist

• I consent that this change becomes part of alphaTab under it's current or any future open source license
• Changes are implemented
• Existing builds tests pass
• New tests were added

Further details

• This is a breaking change
• This change will require update of the documentation/website