Issue #130: Fixed support for indenting by tab
Allow indent a block of code by selecting a range of lines
and pressing 'tab'. The behavior implemented is the same as
the one in Sublime Text editor since I found it intuitive enough.
#define xm_information_width 11
#define xm_information_height 24
static char xm_information_bits[] = {
0x00, 0x00, 0x78, 0x00, 0x54, 0x00, 0x2c, 0x00, 0x54, 0x00, 0x28, 0x00,
0x00, 0x00, 0x00, 0x00, 0x7e, 0x00, 0x2a, 0x00, 0x5c, 0x00, 0x28, 0x00,
0x58, 0x00, 0x28, 0x00, 0x58, 0x00, 0x28, 0x00, 0x58, 0x00, 0x28, 0x00,
0x58, 0x00, 0xae, 0x01, 0x56, 0x01, 0xaa, 0x00, 0x00, 0x00, 0x00, 0x00};