## Link to GitHub Issue or related Pull Request, if one exists
#574
## Description of change
Refactor so that grouping of lights are in common I/O code. Add this to
IIDX/SDVX/DDR/GitaDora.
## Testing
## Link to GitHub Issue, if one exists
#0
## Description of change
Occasionally we would read a bad "vKey" for an analog axis and end up
accessing invalid memory (beyond the size of a vector) and potentially
crash or read junk values.
## Testing
Fixed based on minidump, this was a rare repro though.
## Link to GitHub Issue, if one exists
Fixes#139
## Description of change
Add an option for detecting window focus when accepting input.
The new default will be to have the following:
* naive bindings will check for window focus
* rawinput binds are not affected, will continue to be accepted
regardless of focus
Other options (always / never choices) can be picked by the user to
tweak the behavior if needed.
Clean up usage of `0xff` constant to represent invalid naive vkey.
## Testing
Still in progress, especially in regards to performance.
On a i7-9700 system, 10000 calls to `superexit::has_focus()` takes
250-350 microseconds, so this should not be a big deal at all.
bicarus