Oleg Khryptul

Add `Gui:setBackgroundImage(Tex2D)` method to set a background image to any element. Internally this will set background image of the widget. Also we won't need `Gui:image()` anymore and it should be...

```[tasklist] - [ ] https://github.com/Limit-Theory-Redux/ltheory/issues/160 - [ ] https://github.com/Limit-Theory-Redux/ltheory/issues/166 - [ ] https://github.com/Limit-Theory-Redux/ltheory/issues/195 - [ ] #211 - [ ] https://github.com/Limit-Theory-Redux/ltheory/issues/194 - [ ] https://github.com/Limit-Theory-Redux/ltheory/issues/257 - [ ] https://github.com/Limit-Theory-Redux/ltheory/issues/164 -...

Add support containers transferring between Lua and Rust. Idea: 1. For the copyable types (in Lua context, i.e. integers; Vec3 won't work) generate wrappers with element indexing (`[i]`). 2. For...

Closes #164

Replace freetype-sys with freetype-rs

Idea was suggested by @dgavedissian [here](https://github.com/Limit-Theory-Redux/ltheory/pull/118#discussion_r1238919806). It is possible now to return Result from the impl methods with **luajit_ffi** attribute. In this case Rust will panic in the case of...