v2.1

Maintenance release:

• fix Button_EventGet() array index overlap
• fix button state set to BTN_STATE_SHORT despite debounce lock

v2.0

New feature:

• Add adjustable long press time for each button
• Add parameters checks to init function
• Add default values for some variables, which makes initialization easier
• Add unit-testing
• Code style was changed
• Remove some dead code

v1.0

Version 1.0:

• Up to 255 buttons handling
• Buttons debounce filtering
• Single short press handling
• Single long press handling
• Short release button callback function
• Long press button callback function
• Long release button callback function