The %{PR} tag is introduced for this. It resets all colors as well as
the activation of the underline and overline and font.
This has become necessary because we don't track what raw tags a user
injects into the formatting string and otherwise their raw tags could
bleed through.
This doesn't touch action tags because even before raw action tags
weren't being tracked. Action tags also have the requirement that they
have to be used in pairs, so closing them prematurely could break things
(for example with click actions for the entire bar)
Defining an action without a button index caused a segfault since
the parser was treating it as the close of a previously opened action
block. This makes the parser use button LEFT as a fallback.
Also ensure that an action block has been opened before
attempting to close the block.
Fixesjaagr/lemonbuddy#104
