orx-kinect refactoring + new general orx-depth-camera (#257)

orx-fx/src/commonMain/kotlin/colormap/ColormapFilter.kt

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+package org.openrndr.extra.fx.colormap
+
+import org.openrndr.draw.Filter
+import org.openrndr.extra.fx.mppFilterShader
+import org.openrndr.extra.parameters.DoubleParameter
+
+abstract class ColormapFilter(code: String, name: String) : Filter(mppFilterShader(code, name)) {
+
+    @DoubleParameter(label = "min value", low = 0.0, high = 1.0, order = 0)
+    var minValue: Double by parameters
+
+    @DoubleParameter(label = "max value", low = 0.0, high = 1.0, order = 1)
+    var maxValue: Double by parameters
+
+    @DoubleParameter(label = "curve", low = 0.001, high = 10.0, order = 2)
+    var curve: Double by parameters
+
+    init {
+        minValue = 0.0
+        maxValue = 1.0
+        curve = 1.0
+    }
+
+}

orx-fx/src/commonMain/kotlin/colormap/GrayscaleColormap.kt

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+package org.openrndr.extra.fx.colormap
+
+import org.openrndr.extra.fx.fx_grayscale_colormap
+import org.openrndr.extra.parameters.Description
+
+/**
+ * Maps values of the RED color channel to grayscale.
+ */
+@Description("grayscale colormap")
+class GrayscaleColormap : ColormapFilter(fx_grayscale_colormap, "grayscale-colormap")

orx-fx/src/commonMain/kotlin/colormap/SpectralZucconiColormap.kt

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+package org.openrndr.extra.fx.colormap
+
+import org.openrndr.extra.fx.fx_spectral_zucconi_colormap
+import org.openrndr.extra.parameters.Description
+
+/**
+ * Maps values of the RED color channel to natural light dispersion spectrum as described
+ * by Alan Zucconi in the
+ * [Improving the Rainbow](https://www.alanzucconi.com/2017/07/15/improving-the-rainbow/)
+ * article.
+ */
+@Description("spectral colormap")
+class SpectralZucconiColormap : ColormapFilter(fx_spectral_zucconi_colormap, "spectral-zucconi-colormap")

orx-fx/src/commonMain/kotlin/colormap/TurboColormap.kt

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+package org.openrndr.extra.fx.colormap
+
+import org.openrndr.extra.fx.fx_turbo_colormap
+import org.openrndr.extra.parameters.Description
+
+/**
+ * Maps values of the RED color channel to Turbo Colormap according to
+ * [Turbo, An Improved Rainbow Colormap for Visualization](https://ai.googleblog.com/2019/08/turbo-improved-rainbow-colormap-for.html)
+ * by Google.
+ */
+@Description("turbo colormap")
+open class TurboColormap : ColormapFilter(fx_turbo_colormap, "turbo-colormap")