Add option to Count From 0 or 1 in UI

[bazz1tv]

Depends on #50 (checkbox)

Not everyone is a coder and enjoys counting from 0. Maintain the internal implementation but adjust the UI results based on this new setting (or group of settingz)

• pattern sequencer indices
• pattern numbers
• sample indices
  • sample panel
  • instrument editor
• pattern rows

There is going to be a single discrepancy. Instruments always count from 1, because instrument 0 is the code for no instrument. This could also be adjustable, but let's not go there.