fix scrolling for multiline text

Merge version 'v1.89.7'

Merge version 'v1.89.6'

Merge version 'v1.89.5'

Merge version 'v1.89.4'

Merge version 'v1.89.3'

Merge version 1.89.2

Added Win32 + DirectX 11 backends and example

fixed some memory leaks

Fixed a bug in text length calculation