## Link to GitHub Issue, if one exists
#345
## Description of change
For IIDX / SDVX, when the subscreen surface failed to capture, display
an error message, suggesting the user to patch the game as needed.
Prior to this change, the subscreen overlay just showed an invisible
window if this happened.
## Testing
Tested IIDX windowed / full screen, and voltex full screen.
## Link to GitHub Issue, if one exists
n/a
## Description of change
Update ImGui to `v1.91.4`. We can't update to `v1.91.5` or newer just
yet because impl_spice depends on the old IO model of ImGui which got
removed in `v1.91.5`.
We also can't update the DX9 renderer right now, because at some point
overlay breaks in TDJ (and only in TDJ...)
Enable the new debug logging functionality in ImGui. Add a button in
overlay to toggle debug log window.
Fix some minor bugs spotted by the new ImGui debug log: mismatched API
calls, font loading issues.
## Compiling
👍
## Testing
In progress.
bicarus-dev