Restructure DashboardItems

- Add a new class DashboardTextItem that is a DashboardItem that can render text with font

modules/base/dashboard/dashboarditemmission.cpp

@@ -37,22 +37,6 @@
 #include <stack>
 
 namespace {
-    constexpr const char* KeyFontMono = "Mono";
-    constexpr const float DefaultFontSize = 15.f;
-
-    constexpr openspace::properties::Property::PropertyInfo FontNameInfo = {
-        "FontName",
-        "Font Name",
-        "This value is the name of the font that is used. It can either refer to an "
-        "internal name registered previously, or it can refer to a path that is used."
-    };
-
-    constexpr openspace::properties::Property::PropertyInfo FontSizeInfo = {
-        "FontSize",
-        "Font Size",
-        "This value determines the size of the font that is used to render the date."
-    };
-
     std::string progressToStr(int size, double t) {
         std::string progress = "|";
         int g = static_cast<int>((t * (size - 1)) + 1);
@@ -72,62 +56,9 @@ namespace {
 
 namespace openspace {
 
-documentation::Documentation DashboardItemMission::Documentation() {
-    using namespace documentation;
-    return {
-        "DashboardItem Mission",
-        "base_dashboarditem_mission",
-        {
-            {
-                "Type",
-                new StringEqualVerifier("DashboardItemMission"),
-                Optional::No
-            },
-            {
-                FontNameInfo.identifier,
-                new StringVerifier,
-                Optional::Yes,
-                FontNameInfo.description
-            },
-            {
-                FontSizeInfo.identifier,
-                new IntVerifier,
-                Optional::Yes,
-                FontSizeInfo.description
-            }
-        }
-    };
-}
-
 DashboardItemMission::DashboardItemMission(const ghoul::Dictionary& dictionary)
-    : DashboardItem(dictionary)
-    , _fontName(FontNameInfo, KeyFontMono)
-    , _fontSize(FontSizeInfo, DefaultFontSize, 6.f, 144.f, 1.f)
-{
-    documentation::testSpecificationAndThrow(
-        Documentation(),
-        dictionary,
-        "DashboardItemMission"
-    );
-
-    if (dictionary.hasKey(FontNameInfo.identifier)) {
-        _fontName = dictionary.value<std::string>(FontNameInfo.identifier);
-    }
-    _fontName.onChange([this](){
-        _font = global::fontManager->font(_fontName, _fontSize);
-    });
-    addProperty(_fontName);
-
-    if (dictionary.hasKey(FontSizeInfo.identifier)) {
-        _fontSize = static_cast<float>(dictionary.value<double>(FontSizeInfo.identifier));
-    }
-    _fontSize.onChange([this](){
-        _font = global::fontManager->font(_fontName, _fontSize);
-    });
-    addProperty(_fontSize);
-
-    _font = global::fontManager->font(_fontName, _fontSize);
-}
+    : DashboardTextItem(dictionary, 15.f)
+{}
 
 void DashboardItemMission::render(glm::vec2& penPosition) {
     ZoneScoped