Openrct2: [Feature] OpenTTD-like transparency options

[knomepasi]

Currently transparency and see-throughness of different kinds of objects are handled by separate options available in the menu. You can also bind shortcut keys to them individually.

My suggestion is a new transparency options tool that handles the options for all of the different objects in one window.

Here's a screenshot of the OpenTTD transparency options window:

The top row controls whether the object type is transparent or not (when pressed down, transparency is enabled)
The bottom row controls whether the objects are transparent or see-through when in the "transparent" mode. (Implementing this would be a bonus, not a hard requirement.)

Additionally, a shortcut key (X) is bound to toggle the transparency state for all objects contrary to OpenRCT2, where you currenyly have to hit the shortcut keys for each object group separately.

[IntelOrca]

The window can arguably just be a plugin, but we will need to implement the ability to enable / disable translucent and fully transparent for each visibility option.

[knomepasi]

Here's a Gist with a plugin that adds a simple transparency options window into the game.

https://gist.github.com/knomepasi/cb9f47f24bfd2eae58ef3801239a3c67