split property & values into separate classes and files

Signed-off-by: Folling <mail@folling.io>

src/values/number_value.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+struct IkarusNumberValue {
+    long double value;
+};

src/values/text_value.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <string>
+
+/// \private
+struct IkarusTextValue {
+    std::string value;
+};

src/values/toggle_value.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+/// \private
+struct IkarusToggleValue {
+    bool value;
+};