Added notification/messages to make Effect Strength slider work "live"

[HiCamino]

This works but the gaussian blur could be faster it is "live" but it can be slow if you move the slider too fast. I found this page so maybe I can try to get this to work: https://blog.ivank.net/fastest-gaussian-blur.html but probably in a separate pull request

Fixes #92

[korli]

There is a SetSnoozeAmount() on BSlider to snooze between modification messages on MouseDown(). Default is 20000.
You can surely make it greater when needed.

[HiCamino]

There is a SetSnoozeAmount() on BSlider to snooze between modification messages on MouseDown(). Default is 20000. You can surely make it greater when needed.

thank you for the idea but I think the blur just needs to be faster to feel smoother. I tried to use this snooze amount to get rid of the extra tmp bitmap in ChangeSettings because it is only to stop flickering but it didn't work without the tmp bitmap no matter what number I put in there. even 1000000.