Document and use new macro definitions

Author: vhorvath-gs

README.md

@@ -38,6 +38,15 @@ The build script reads the config.json file for required build parameters:
 
 See the example [config.json](https://github.com/GRAPHISOFT/archicad-addon-cmake/blob/master/config.json).
 
+### Definitions in C++ code
+
+The following macro definitions are set to string literals (they expand to `"a C string"`) with values based on the above:
+
+- `ADDON_NAME`: This is the `addOnName` field as is.
+- `ADDON_DESCRIPTION`: This is the `description` field as is.
+- `ADDON_VERSION`: This is the 3 component version number derived from `version`.
+  - Example: this macro definition expands to `"123.0.0"` if the value of `version` is `"123"`.
+
 ## Detailed instructions
 
 If the provided build script doesn't work for you, you can set up your environment manually.

RINT/AddOn.grc

@@ -9,7 +9,7 @@
 /* [  1] */		"Example AddOn Command... ^E3 ^ES ^EE ^EI ^ED ^ET ^10001"
 }
 
-'GDLG' ID_ADDON_DLG Modal | grow   40   40  345  128  "Example Dialog" {
+'GDLG' ID_ADDON_DLG Modal | grow   40   40  345  128  "" {
 /* [  1] */ Button				  245   95   90   23	LargePlain  "OK"
 /* [  2] */ Button				  145   95   90   23	LargePlain  "Cancel"
 /* [  3] */ Separator			   10   83  325    2

Src/AddOnMain.cpp

@@ -31,6 +31,7 @@ class ExampleDialog :	public DG::ModalDialog,
 		cancelButton (GetReference (), CancelButtonId),
 		separator (GetReference (), SeparatorId)
 	{
+		SetTitle (u"" ADDON_NAME " " ADDON_VERSION ""sv);
 		AttachToAllItems (*this);
 		Attach (*this);
 	}