String class now uses char32_t as base type, to be compatible with std::u32string.
Some minor refactor: replaced Uint32 type in hashes in favor of String::HashType. Replaced Uint32 type in keycodes in favor of Keycode.
Changed String::hash(String) from CRC32 to std::hash<std::u32string> (many times faster).
And more random refactors and small features in the code editor.
Fixed UISceneNode size, now it's set in pixels instead of dp to allow to always be the same size as the window.
Fixed styles and layouts not updating in time before calling draw.
Fixed a double delete crash when using UIDropDownList and UIWinMenu.
Now UI elements can be dragged even if the mouse cursor goes out of the window limits.
UIScrollBar slider now can be dragged also from the horizontal edges that are not part of the button slider (this allows to scroll from the edge for example in maximized windows).
Fixed TextDocument on emscripten.
Disabled fullscreen window minimizing on focus loss (SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS).
