This patch solves the following problem: In order to obtain light shadows, the inner color should be changed to a light gray, resulting in light shadows that work well over lighter backgrounds, but look like glowing over darker backgrounds. The following screenshot shows this situation:
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In order to allow having light shadows that behave as shadows over darker backgrounds I've introduced a new option for setting the overall shadow intensity. This value defaults to 100%, making shadows behave as they did prior to this patch.
With this new option, light shadows can be obtained setting the inner color to black, and the intensity to a low value. Here's how it looks with an intensity of 50%.
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