add doc/*/scripting/builtins/libgfx-blockwraps.md

doc/en/scripting/builtins/libgfx-blockwraps.md

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+# Library *gfx.blockwraps*
+
+Library for working with *block wrappers*.
+
+Block wrappers are introduced to implement block destruction animation and can be used for other purposes.
+
+```lua
+-- Creates a wrapper at the specified position, with the specified texture.
+-- Returns the wrapper id.
+gfx.blockwraps.wrap(position: vec3, texture: str) --> int
+
+-- Removes the wrapper, if it exists.
+gfx.blockwraps.unwrap(id: int)
+
+-- Changes the position of the wrapper, if it exists.
+gfx.blockwraps.set_pos(id: int, position: vec3)
+
+-- Changes the texture of the wrapper, if it exists.
+gfx.blockwraps.set_texture(id: int, texture: str)
+```
+
+Wrappers are not automatically removed without calling `unwrap`.