Add support for character search
Add support for character search

Add support to search number (for example: `1234`) in character string as characters instead of integers. It also supports searching of characters directly in hex form for characters such as `\xff`.
0xddaa/pwndbg,anthraxx/pwndbg,anthraxx/pwndbg,0xddaa/pwndbg,0xddaa/pwndbg,pwndbg/pwndbg,anthraxx/pwndbg,cebrusfs/217gdb,anthraxx/pwndbg,disconnect3d/pwndbg,pwndbg/pwndbg,pwndbg/pwndbg,pwndbg/pwndbg,cebrusfs/217gdb,cebrusfs/217gdb,chubbymaggie/pwndbg,zachriggle/pwndbg,zachriggle/pwndbg,disconnect3d/pwndbg,cebrusfs/217gdb,chubbymaggie/pwndbg,disconnect3d/pwndbg