[2.0.x] Tweaks and additions for MAX7219

[thinkyhead]

Adjustments made while playing around with a MAX7219 unit….

• Add an option to rotate the display in increments of 90° (CCW).
• Add an option to enable/disable the init test pattern.
• Slightly optimize the initialization test pattern.
• Add a spiral-shaped initialization test-pattern.
• Add some inline helpers to display dual-row quantities and indicators.
• Add functions to draw digits on 8-digit numeric displays.
• Fix buffer depth display, which was off by one.
• Use MAX7219_DEBUG_PRINTER_ALIVE as an opportunity to re-initialize.
• Allow TAIL/HEAD to be shown on the same line (as a range).

Counterpart to #11033