Grid texture alpha color control

[saxondigital]

Control the grid texture maps alpha transparency separately from the grid lines.

[saxondigital]

Repurpose node table 'color_shift' column to be 'texture_alpha' to control the grid texture transparency.

• Rename np_node tables color_shift field to texture_alpha.
• Alt+9 to decrease opacity of the grid texture.
  • Shift+Alt+9 for previous altColor (grid textue color).
• Alt+0 to increase opacity.
  • Shift+Alt+0 for next altColor.

*Current default altPalette = 0 and can only be changed in the node CSV table.

[saxondigital]

Implemented in v0.233.4 (2022-12-18).