Update and replace some icons & ASCII font for TFT24/28

[guruathwal]

• Replace the unlicensed/copyrighted delta calibration icon.
• Rename 'calibration.bmp' to 'delta_calibrate.bmp'
• Update corner/manual levelling icons.
• Remove duplicate marlin mode icon and add touch mode icon.
• update ASCII font for TFT24/28 to be slightly taller and easy to read.

[radek8]

You can look at the icons marlin.bmp a marlin_mode.bmp?
These two icons could be merged into one. It is an unnecessary waste of space on two icons with the same meaning.

[guruathwal]

Yes that makes sense. I will change it.

[radek8]

Round icons (touch_mode and marlin_mode) updated in PR # 2251

Was there a license problem on the Delta icon? Will it be necessary to fix the round delta icon?

[guruathwal]

Yes, it should be fixed as the icon is not licensed to be used here.

[digant73]

good you updated fonts for TFT24/28. Many people (one of that it's me) had problems reading in particular some letters/numbers (e.g. 0 very similar to 6 and 8). At the end, I only lost about 1 diopter :-)

[kisslorand]

The update of the ASCII fonts for 2.4" and 2.8" TFT is highly welcomed. In some places the text position should be lowered a bit (2-3) pixels to be vertically centered (one such place would be the status screen).