Added ability to add earmarks by using Shift+<number>

Added the ability to add (and append) earmarks by pressing Shift + (effectively inputting "!" for 1, "@" for 2 and so on) It will check for existing earmarks and append to the list, throwing leftmost (after sorting smallest) number if 3 earmarks already present It will also override user entered number, but will not touch preset ones (as is the case with current earmark implementation)