Internal code changes.

Full Changelog: v0.2.2...v0.2.3

Bug fix.

Enabled Link-Time Optimization (LTO) for release builds.

Usability Improvements

• Added ability to open images in other formats (e.g jpeg, png).
• Added Ctrl-Click for picking color from canvas.
• Modified palette logic so when there is no empty spot, selector stays in place.
• Splash screen now runs as files load indicator.
• Default to .svg for new file.

Internal

• Fixed flicker/clearing of canvas issues.
• Improved drawing by reducing number of on_state calls.
• Simpler mouse_over in tui_engine.
• event_loop and tui_engine internals touch ups.

Bug fix.

Providing pre-built binaries.

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