isWhite, isLower, isUpper, toLower, and toUpper now have Ascii in their
name, which matches what std.unit does with its versions of those
functions. Hopefully, it should also reduce bugs due to using the wrong
function between the ASCII and unicode versions by making the difference
more obvious.
std.algorithm: defined move with one argument; levenshtein distance generalized to with all forward ranges; take now has swapped arguments
std.array: empty for arrays is now a @property; front and back for a string and wstring automatically decodes the first/last character; popFront, popBack for string and wstring obey the UTF stride
std.conv: changed the default array formatting from "[a, b, c]" to "a b c"
std.range: swapped order of arguments in take
std.stdio: added readln template
std.variant: now works with statically-sized arrays and const data
std.traits: added isNarrowString
