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 HandleLight_width 8
#define HandleLight_height 8
static char HandleLight_bits[] = {
0x00, 0x40, 0xc0, 0xc0, 0xc0, 0xc0, 0x60, 0x3c};