Added detailschange and -formechange, which detail when a pokemon
undergoes a forme change (Mega Evolution, etc.), as well as -transform,
for when a Pokemon uses Transform/Imposter.
Added damage-related messages: -crit, -supereffective, -resisted, -immune.
Added details regarding items via -item, -enditem.
Added more detail about status messages with -curestatus, -cureteam.
Added documentation for the following battle messages: request, move,
switch, -damage/-heal, -boost/-unboost, faint, cant.
Other messages will come next, followed perhaps by how to send moves.
Also, changed most bold headers to h4 headers so that the hierarchy for
battle messages could be more obvious.
