added new feature (hidden)

the Idea was to add an option to real-time parse the text, so that every
<interval> milliseconds the text gets re-parsed starting with a upper-
or lowercase letter randomly and changing the exclamation marks into
ones randomly. The problem with this is obvious: after some time all the
exclamation marks get converted into ones.
TODO: Fix the problem with the '!'s and add a separate counter for
upper/lowercase letters so that non-alphabetical characters don't get
counted (Example: "LoL LoL" instead of "LoL lOl")