Treeview Docs

Added Treeview docs
Improved some stuff in the treeview object

docs/objects/Treeview/isSelectionColorActive.md

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+## isSelectionColorActive
+
+### Description
+
+Checks if the selection color is active for the Treeview object.
+
+### Returns
+
+1. `boolean` A boolean value indicating whether the selection color is active (`true`) or not (`false`).
+
+### Usage
+
+* Creates a Treeview, sets the selection colors, and checks if the selection color is active:
+
+```lua
+local basalt = require("basalt")
+
+local mainFrame = basalt.createFrame()
+local treeview = mainFrame:addTreeview()
+  :setSelectionColor(colors.blue, colors.white)
+
+local active = treeview:isSelectionColorActive()
+
+basalt.debug("Selection color active:", active)
+
+basalt.autoUpdate()
+```
+
+In this example, a Treeview object is created and added to the mainFrame. The `setSelectionColor` method is used to set the background color to blue and the foreground color to white. The `isSelectionColorActive` method is then used to check if the selection color is active.