Add flash status including writing address, speed, progress and left time

[young-mu]

The status are shown below when flashing,

example 1.

flash start address 0x0 (0K)
ICDI version: 12245
writing: 0x5d000, speed: 9.88KB/s, progress: 100.00%, ETA: 0.00s

example 2.

flash start address 0x7D000 (500K)
ICDI version: 12245
writing: 0x88400, speed: 9.86KB/s, progress: 100.00%, ETA: 0.00s

[utzig]

Please fix the indentation, you seem to be using spaces instead of tabs. Also to maintain consistency, variables should be declared at the beginning of functions (not C99).

[young-mu]

OK, please check the updated codes.