Added TabControl Element

Added ComboBox Element
Added/Updated Switch Element

Fixed TextBox Syntax Highlighting Bug

examples/TabControl.lua

@@ -0,0 +1,35 @@
+local basalt = require("basalt")
+
+local frame = basalt.getMainFrame()
+
+local tabs = frame:addTabControl({x = 2,
+y = 2,
+width = 35,
+height = 12,
+headerBackground = colors.black,
+foreground = colors.lightGray
+})
+
+
+-- create three tabs; addTab now returns a proxy for adding elements into the new tab
+local overview = tabs:newTab("Overview")
+local editor = tabs:newTab("Editor")
+local settings = tabs:newTab("Settings")
+
+-- Overview tab: add a label and a button
+overview:addLabel({x = 2, y = 2, width = 46}):setText("Welcome to the demo")
+overview:addButton({x = 2, y = 4, width = 12, height = 3}):setText("Click me")
+:setBackground("{self.clicked and colors.green or colors.black}")
+:setForeground("{self.clicked and colors.black or colors.lightGray}")
+
+-- Editor tab: textbox with some sample text
+editor:addTextBox({x = 2, y = 2, width = 12, height = 8, background=colors.black, foreground=colors.white}):setText("Type here...\nLine 2\nLine 3")
+
+-- Settings tab: show some inputs
+settings:addLabel({x = 2, y = 2, width = 20}):setText("Settings")
+settings:addLabel({x = 2, y = 4, width = 20}):setText("Username:")
+settings:addLabel({x = 2, y = 6, width = 20}):setText("Password:")
+settings:addInput({x = 12, y = 4, width = 20, background=colors.black, foreground=colors.white})
+settings:addInput({x = 12, y = 6, width = 20, background=colors.black, foreground=colors.white})
+
+basalt.run()