Change UI and GL events execution

[AlexanderVorobyov]

• Change dependencies: remove com.ugf.customsettings package.
• Add GL rendering support for multiple cameras.
• Add DebugUIComponent and DebugGLComponent componets to initialize and execute UI and GL drawers.
• Add DebugGL.DefaultMaterial property and SetDefaultMaterial() and ClearDefaultMaterial() methods to control default material used when creating GL draw commands.
• Add DebugGLUtility.CreateDefaultMaterial() method to create default material used with GL draw commands.
• Remove DebugGL.GetDefaultMaterial() method, use DefaultMaterial property instead.
• Remove DebugGLUtility.DefaultMaterial property, use DebugGL.DefaultMaterial property instead.
• Remove DebugUISettings and DebugGLSettings project settings, use components instead.
• Remove DebugUIEventComponent component class.

[AlexanderVorobyov]

Linked Issue: #5.