New symbol: double_line: ═
New block symbols: upper_block_1: ▔, upper_block_4: ▀,
lower_block_1: ▁, etc. lower_block_8: █
(lower_block_8 is also known as full_block.)
Better detection of UTF-8 support: use the official l10n_info()
function
Three more symbols: neq: ≠, geq: ≥, leq: ≤
First released version.