fix unicode typenames (illegal in py2)
fix unicode event names
fix stacklayout size_hint calculations to include spacing if necessary
better algorithm.
implement `resizable` config option in sdl2 window
get  value in the window provider
Merge pull request #2657 from kivy/sdl2_resize

Implement `resizable` config option in sdl2 window
mainthread decorator doc revision, fixes #2652
Merge pull request #2670 from kivy/mainthread_doc

Mainthread decorator doc revision, fixes #2652
rename KIVY_SDL_PATH TO KIVY_SDL2_PATH and clean up env var query
Merge pull request #2672 from kivy/sdl2_path

Rename KIVY_SDL_PATH TO KIVY_SDL2_PATH and clean up env var query
fix stripping for wrapped text
always build sdl2, if available
add sdl2 deps to debian control
move sdl2 providers below pygame
Merge pull request #2677 from kived/textwrap-strip

fix stripping for wrapped text
doc: add a Common Pitfalls section to RelativeLayout
add images
fix export_to_png with img_sdl2
added pxd for Svg