Update the README

README.md

@@ -1,3 +1,10 @@
+## *** UNFINISHED, EXPERIMENTAL, PROTOTYPE-QUALITY CODE! ***
+
+- _The last version (0.6.0) was built against SFML@698f265 (and is incompatible with most other SFML versions!)._
+- _A successor is being worked on, which will be published if/when sufficiently matured._
+
+-------
+
 [![Build](https://github.com/xparq/sfw/actions/workflows/build.yml/badge.svg)](https://github.com/xparq/sfw/actions/workflows/build.yml)
 
 sfw::GUI - A fork of "SFML Widgets", a small & simple SFML-based GUI
@@ -7,27 +14,27 @@ Original (upstream) author: Alexandre Bodelot <alexandre.bodelot@gmail.com>
 
 License: [MIT License](http://opensource.org/licenses/MIT) (See the `LICENSE` file.)
 
+
 ## Changes to the original:
 
 - Adapted to the upcoming SFML v3 API
-- Compiling as C++20 now (to embrace recent C++ features; SFML3 is C++17 already)
-- Richer, more flexible API, new features, bugfixes, improvements
+- Richer, more flexible API, new features, improvements, bugfixes
 - Default quick-start assets included (and removed the non-free ones)
 - Windows build (MSVC & GCC (via [w64devkit](https://github.com/skeeto/w64devkit), so MingW should also work))
 - Auto download & setup the latest SFML-master locally (mostly for GitHub workflows)
-- Reshuffled repo tree (to allow growth & to help integrating into other projects)
+- Requires some C++23 features (e.g. std::expected)
 
-_For other (both planned and completed) changes see the [issues](https://github.com/xparq/sfw/issues)!_
 
-## Quick Summary
+## Main features:
 
 - Moderately sized package with no external dependencies beyond SFML
-- Simple, straightforward, but versatile API
+- Simple, but versatile API
 - Visual styling via spritesheets (small image files to customize borders, markers etc.)
-- Simple optional callbacks for "update" actions (supporting both `[]()` and `[](Widget*)` lambda signatures)
-  _(Any other event handlers can also be overridden in derived widgets, of course.)_
-- Easy layouts: automatically (and dynamically re)align widgets
-- No CMake. (Well, since I never got to learn it, now I just declare this a feature. ;)
+- Optional callbacks for widget updates (supporting both `[]()` and `[](Widget*)` lambda signatures)
+  _(Other event handlers can also be overridden via inheritance.)_
+- Easy layouts: automatically (and dynamically re)positioned/sized widgets
+- Translucent wallpapers, tooltips
+- No CMake. (Well, since I never got to learn it, I just declare this a feature now. ;)
   Use e.g. TGUI if you don't feel warm and cozy without CMake.)
 
 
@@ -36,15 +43,11 @@ _For other (both planned and completed) changes see the [issues](https://github.
 
 ## Build
 
-### GCC/CLANG:
-
-- Run `make` to build the lib (in the `lib` folder) and the example/demo/test executables.
-
-### MSVC (Windows):
-
-- Run `nmake -f Makefile.msvc` for the same.
+- Run `build` on Windows, or `make` on Linux, to create the lib + the example/demo/test executables.
+- MSVC and GCC (both on Linux and w64devkit/MinGW) are auto-detected. (CLANG support has kinda rotted away by now.)
+- The GCC option supports header auto-dependency tracking yet. (No working `clean` rule currently: delete `tmp/build` and the lib binaries under `lib/`)
 
-(See the Makefiles for options.)
+_(See the Makefiles for options.)_
 
 
 ## Use