Make KEY_SHIFT equal to KEY_LEFT_SHIFT, KEY_CTRL equal to KEY_LEFT_CTRL, KEY_ALT equal to KEY_LEFT_ALT.
Merge pull request #9449 from Dhilan007/v3-keycode

Make KEY_SHIFT equal to KEY_LEFT_SHIFT, KEY_CTRL equal to KEY_LEFT_CTRL, KEY_ALT equal to KEY_LEFT_ALT.