Enable / disable cursor after alphaTab is loaded

[Danielku15]

Discussed in #873

^{Originally posted by solveit68 May 24, 2022}
Hello there,

Unfortunately, I am not able to switch the player cursor in my WPF application on or off at the desired time. I probably have to call a render function, but I don't know which one it is.

So once loaded, the cursor is either permanently on or off. Since I sometimes only display individual notes for practice purposes, the cursor is very annoying there.
Can someone please give me a tip?

AlphaTab.Settings.Player.EnableCursor = false;/true
AlphaTab.Render ...

Thank you.

New Features

• On settings update we should create/destroy also the cursors dynamically like we already do for the player. The enabling/disabling should then also have no effect on the player state. And on top: we need to consider that the user interaction (selection and seeking) is independent from the playback cursors.
• We need to ensure that on all platforms the cursor color can be changed dynamically. e.g. on WPF the colors are statically copied once on cursor creation.