Added option to highlight your own messages (#3833)

* Removed magic numbers when checking rowIndex

* Swap from static ints to enum

* Referred enum members by enum name

* Fixed formatting

* Added highlight option for self messages

* Update CHANGELOG.md

* Made disabled by default

* Moved setting from Messages tab to Users tab

* Moved checks to HighlightController

* Set row index to 0

sillE silly me

* Update CHANGELOG.md

* Moved check outside of loop

* Improved naming and documentation on variables

* Fixed formatting

* Fix compile errors

* Update ColorProvider self message highlight color when it's changed

Use the ColorProvider self message highlight color instead of rolling
our own non-updating color

* Update changelog entry

* Remove unused `customColor` from user highlights builder

* Use explicit lambda capture

* Update comment for the color provider color

* HighlightModelHpp: Future-proof custom row enum B)

* Document UserHighlightModel color changes

* Update colorprovider comment

* Update enabled, show in mentions & color setting paths

* Rename settings from `selfMessagesHighlight` to `selfMessageHighlight`

---------

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/providers/colors/ColorProvider.cpp

@@ -81,6 +81,20 @@ void ColorProvider::initTypeColorMap()
                  HighlightPhrase::FALLBACK_HIGHLIGHT_COLOR)});
     }
 
+    customColor = getSettings()->selfMessageHighlightColor;
+    if (QColor(customColor).isValid())
+    {
+        this->typeColorMap_.insert({ColorType::SelfMessageHighlight,
+                                    std::make_shared<QColor>(customColor)});
+    }
+    else
+    {
+        this->typeColorMap_.insert(
+            {ColorType::SelfMessageHighlight,
+             std::make_shared<QColor>(
+                 HighlightPhrase::FALLBACK_SELF_MESSAGE_HIGHLIGHT_COLOR)});
+    }
+
     customColor = getSettings()->subHighlightColor;
     if (QColor(customColor).isValid())
     {

src/providers/colors/ColorProvider.hpp

@@ -16,6 +16,8 @@ enum class ColorType {
     FirstMessageHighlight,
     ElevatedMessageHighlight,
     ThreadMessageHighlight,
+    // Used in automatic highlights of your own messages
+    SelfMessageHighlight,
 };
 
 class ColorProvider