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 VVPanel_width 16
#define VVPanel_height 16
static char VVPanel_bits[] = {
0x80, 0x00, 0x80, 0x00, 0x90, 0x04, 0xa0, 0x02, 0xc0, 0x01, 0x80, 0x00,
0x00, 0x00, 0xff, 0x7f, 0xff, 0x7f, 0x00, 0x00, 0x80, 0x00, 0xc0, 0x01,
0xa0, 0x02, 0x90, 0x04, 0x80, 0x00, 0x80, 0x00};