Wheels, color pickers, lap highscore, slider widgets, fux UI bugs, other...

What is new in the latest release:

* Main Menu: "PC does not support SM6 warning" message.
The game works with DX11, but with some visual glitches. It may be fixed in the future. However, the game runs at 60 FPS on and old laptop with GeForce GTX 960M (low settings with shadows on).

* Customizable wheels!
Wheels can be changed in Paint Shop menu, just pressing a button "Wheels". Wheels can be textured with carbon fiber (with color alpha). One of wheel model has invalid UV with stretched carbon fiber in the middle, don't see it :)

* Awesome mouse clickable HSV and HSVA color pickers!

* Hide UI in the paint shop.
Unhide on any button.

* Fix crash on exit race in spectator mode.

* Switch subsystem Steam/LAN. Current option is stored in Save.

* Fix mouse disappear in menu for no reason.
I found a reason, fixed.

* Variable strobe width on penalty warn.
Yellow taillight warning pulse-width modulation.

* Lap highscore is visible in spectator mode (on server and standalone modes).
Clients don't see a highscore, request-respond things will be later.

* Update axis parameters widget, and custom horizontal slider. Yes, horizontal slider is awesome, they are based on a border with text. LMB Drag - scrolling, RMB - reset.

* Other boring C++ and HLSL things for things above.