Allow searching for codepoints

[treyhunner]

Searching \u2728 or 2728 should search for the character with the code point 0x2728 (10024).

>>> int('2728', 16)
10024

Ideas for later / bonus ideas

Searching for a number that could be a decimal number (like 2728) could also search for the character that uses that decimal code point (e.g. chr(2728)).

Searching for a possible code point could also search for characters with a nearby code point, sorted by their ascending distance from the searched code point.

For example searching \u201c might show these results (note that the "closer" codepoints are at the top of results):

• '\u201c' (“)
• '\u201b' (‛)
• '\u201d' (”)
• '\u201a' (‚)
• '\u201e' („)
• '\u2019' (’)
• '\u201f' (‟)
• '\u2018' (‘)
• '\u2020' (†)
• '\u2017' (‗)
• '\u2021' (‡)