Fix the bug where overlay crashes on closing
Updated Image uploading API

• Updated to latest ImGUI/Veldrid
• Making some function internal so lib users don't use them
• Add functionality to get multiple monitor bounds, this will allow overlay to easily move to different monitor
• Fix a rare bug where overlay gets non-clickable

This is backward incompatible release.

-> Internal Changes
Remove dependency from https://github.com/gmamaladze/globalmousekeyhook
Re-implemented in .NET CORE 2.0

-> API Changes
The render function is now using co-routines (https://github.com/Ellpeck/Coroutine) rather than delegates for better thread management. An OnRender co-routine event is added, that will be called on every frame. Any rendering work should be done by using this co-routine event (as shown in the demo).

Added ability to read keyboard key state

Updating ImGui to 1.75
Updating Veldrid to 4.7.0

Improved CPU usage.