[Ohrrpgce] SVN: teeemcee/13397 gfx_sdl2: allow changing zoom by resizing the window, including fraction

[subversion at HamsterRepublic.com]

teeemcee
2023-12-15 02:02:19 -0800 (Fri, 15 Dec 2023)
254
gfx_sdl2: allow changing zoom by resizing the window, including fractional zoom

This has various loose ends, such 'zoom' that the backend thinks it's running at
not being updated.

Split up 'resizable' into 'resizable_resolution' and 'resizable_window'.
---
U   wip/gfx_sdl2.bas
U   wip/whatsnew.txt