Refactor input stuff

This is the start of a significant refactoring of everything related to sending messages, which is roughly:
- the chatbox
- action handling
- message sending on the c++ side
- autocompletion of users/rooms/emojis/commands/things i forgot

Notable changes so far include:
- ChatBox is now a ColumnLayout. As part of this, i removed the height animations for now. <del>as far as i can tell, they were broken anyway.</del> I'll readd them later
- Actions were refactored to live outside of the message sending function and are now each an object; it's mostly a wrapper around a function that is executed when the action is invoked
- Everything that used to live in ChatBoxHelper is now in NeoChatRoom; that means that the exact input status (text, message being replied to, message being edited, attachment) is now saved between room switching).
- To edit/reply an event, set `NeoChatRoom::chatBox{edit,reply}Id` to the desired event id, `NeoChatRoom::chatBox{reply,edit}{User,Message}` will then be updated automatically
- Attachments behave equivalently with `NeoChatRoom::chatBoxAttachmentPath`
- Error message reporting from ActionsHandler has been fixed (same fix as in !517) and moved to NeoChatRoom


Broken at the moment:
- [x] Any kind of autocompletion
- [x] Mentions
- [x] Fancy effects
- [x] sed-style edits
- [x] last-user-message edits and replies
- [x] Some of the actions, probably
- [x] Replies from notifications
- [x] Lots of keyboard shortcuts
- [x] Custom emojis
- [x] ChatBox height animations

TODO:
- [x] User / room mentions based on QTextCursors instead of the hack we currently use
- [x] Refactor autocompletion stuff
- [x] ???
- [x] Profit

src/neochatroom.cpp

@@ -3,8 +3,6 @@
 
 #include "neochatroom.h"
 
-#include <cmark.h>
-
 #include <QFileInfo>
 #include <QMetaObject>
 #include <QMimeDatabase>
@@ -642,24 +640,6 @@ void NeoChatRoom::removeLocalAlias(const QString &alias)
     setLocalAliases(a);
 }
 
-QString NeoChatRoom::markdownToHTML(const QString &markdown)
-{
-    const auto str = markdown.toUtf8();
-    char *tmp_buf = cmark_markdown_to_html(str.constData(), str.size(), CMARK_OPT_HARDBREAKS);
-
-    const std::string html(tmp_buf);
-
-    free(tmp_buf);
-
-    auto result = QString::fromStdString(html).trimmed();
-
-    result.replace("<!-- raw HTML omitted -->", "");
-    result.replace("<p>", "");
-    result.replace("</p>", "");
-
-    return result;
-}
-
 QString msgTypeToString(MessageEventType msgType)
 {
     switch (msgType) {
@@ -684,11 +664,6 @@ QString msgTypeToString(MessageEventType msgType)
     }
 }
 
-QString NeoChatRoom::preprocessText(const QString &text)
-{
-    return markdownToHTML(text);
-}
-
 void NeoChatRoom::postMessage(const QString &rawText, const QString &text, MessageEventType type, const QString &replyEventId, const QString &relateToEventId)
 {
     postHtmlMessage(rawText, text, type, replyEventId, relateToEventId);
@@ -1094,7 +1069,99 @@ void NeoChatRoom::reportEvent(const QString &eventId, const QString &reason)
     auto job = connection()->callApi<ReportContentJob>(id(), eventId, -50, reason);
     connect(job, &BaseJob::finished, this, [this, job]() {
         if (job->error() == BaseJob::Success) {
-            Q_EMIT positiveMessage(i18n("Report sent successfully."));
+            Q_EMIT showMessage(Positive, i18n("Report sent successfully."));
+            Q_EMIT showMessage(MessageType::Positive, i18n("Report sent successfully."));
         }
     });
 }
+
+QString NeoChatRoom::chatBoxText() const
+{
+    return m_chatBoxText;
+}
+
+void NeoChatRoom::setChatBoxText(const QString &text)
+{
+    m_chatBoxText = text;
+    Q_EMIT chatBoxTextChanged();
+}
+
+QString NeoChatRoom::chatBoxReplyId() const
+{
+    return m_chatBoxReplyId;
+}
+
+void NeoChatRoom::setChatBoxReplyId(const QString &replyId)
+{
+    m_chatBoxReplyId = replyId;
+    Q_EMIT chatBoxReplyIdChanged();
+}
+
+QString NeoChatRoom::chatBoxEditId() const
+{
+    return m_chatBoxEditId;
+}
+
+void NeoChatRoom::setChatBoxEditId(const QString &editId)
+{
+    m_chatBoxEditId = editId;
+    Q_EMIT chatBoxEditIdChanged();
+}
+
+NeoChatUser *NeoChatRoom::chatBoxReplyUser() const
+{
+    if (m_chatBoxReplyId.isEmpty()) {
+        return nullptr;
+    }
+    return static_cast<NeoChatUser *>(user((*findInTimeline(m_chatBoxReplyId))->senderId()));
+}
+
+QString NeoChatRoom::chatBoxReplyMessage() const
+{
+    if (m_chatBoxReplyId.isEmpty()) {
+        return {};
+    }
+    return eventToString(*static_cast<const RoomMessageEvent *>(&**findInTimeline(m_chatBoxReplyId)));
+}
+
+NeoChatUser *NeoChatRoom::chatBoxEditUser() const
+{
+    if (m_chatBoxEditId.isEmpty()) {
+        return nullptr;
+    }
+    return static_cast<NeoChatUser *>(user((*findInTimeline(m_chatBoxEditId))->senderId()));
+}
+
+QString NeoChatRoom::chatBoxEditMessage() const
+{
+    if (m_chatBoxEditId.isEmpty()) {
+        return {};
+    }
+    return eventToString(*static_cast<const RoomMessageEvent *>(&**findInTimeline(m_chatBoxEditId)));
+}
+
+QString NeoChatRoom::chatBoxAttachmentPath() const
+{
+    return m_chatBoxAttachmentPath;
+}
+
+void NeoChatRoom::setChatBoxAttachmentPath(const QString &attachmentPath)
+{
+    m_chatBoxAttachmentPath = attachmentPath;
+    Q_EMIT chatBoxAttachmentPathChanged();
+}
+
+QVector<Mention> *NeoChatRoom::mentions()
+{
+    return &m_mentions;
+}
+
+QString NeoChatRoom::savedText() const
+{
+    return m_savedText;
+}
+
+void NeoChatRoom::setSavedText(const QString &savedText)
+{
+    m_savedText = savedText;
+}