Initial release - v1.0.0

Initial release v1.0.0.

New :

• Added custom fonts
• Added new Italian translations

Modified :

• Made the calculator button icons bigger
• Changed the font of the calculator buttons
• Changed the font of the input & result displays
• Changed the backspace icon for a filled one
• Switched the colors of the AC button with the equals button
• Updated all the other icons for rounded ones
• Overhauled the about page
• Changed the base theme (light and dark)
• Updated the appearance of a history item
• Changed the elevation and color of the popup menus
• Changed the color of the switches