asciiBorder function
Creates a plain ASCII border style.
Implementation
UvBorder asciiBorder() => const UvBorder(
top: Side(content: '-'),
bottom: Side(content: '-'),
left: Side(content: '|'),
right: Side(content: '|'),
topLeft: Side(content: '+'),
topRight: Side(content: '+'),
bottomLeft: Side(content: '+'),
bottomRight: Side(content: '+'),
);