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 RadioOff_width 15
#define RadioOff_height 15
static unsigned char RadioOff_bits[] = {
0xe0, 0x03, 0xf8, 0x0f, 0x1c, 0x1c, 0x0e, 0x38, 0x06, 0x30, 0x03, 0x60,
0x03, 0x60, 0x03, 0x60, 0x03, 0x60, 0x03, 0x60, 0x06, 0x30, 0x0e, 0x38,
0x1c, 0x1c, 0xf8, 0x0f, 0xe0, 0x03};