Update unicode.pl

-Add /charblocks to list all the available Unicode blocks (e.g. if grep.pl is loaded, /grep -i math /charblocks will list all blocks with math symbols).
-Update /unicode command to display the perl string literals for each character.
Example:
/unicode ☎ 
☎ (U+260E): BLACK TELEPHONE
block=Miscellaneous Symbols, category=So, **perl=\xe2\x98\x8e**, script=Common
This information is useful for /eval (e.g. /eval /echo The \xe2\x98\x8e is ringing!).