[EQK-32] Need to diversify value editing dialogs depending on the data type in a table cell

1) Need to replace the textfield in the "default" dialog with a textarea (consider: display textarea if only the stored text exceeds a certain threshold, like 100 chars, to not display textarea for small chunks of text)
2) Need to add a numeric up-down / a textfield with numbers validator for numeric values
3) And a date picker for Calendar-typed values
4) And a checkbox for booleans