Add CLI Arg to replace default "Me" value

[ReagentX]

ME should be overridden by custom text.

imessage-exporter/imessage-exporter/src/app/runtime.rs

Lines 248 to 252 in 9a40b7b

	/// Determine who sent a message
	pub fn who(&self, handle_id: &i32, is_from_me: bool) -> &str {
	if is_from_me {
	ME
	} else {

imessage-exporter/imessage-exporter/src/exporters/html.rs

Lines 465 to 470 in b61493b

	fn format_annoucement(&self, msg: &'a Message) -> String {
	let mut who = self.config.who(&msg.handle_id, msg.is_from_me);
	// Rename yourself so we render the proper grammar here
	if who == ME {
	who = "You"
	}