Fixed up before doing the upgrade to SFML 3.0

Makefile

@@ -0,0 +1,27 @@
+all: build
+
+reset:
+	powershell -executionpolicy bypass .\scripts\reset_build.ps1
+
+build:
+	meson compile -j 4 -C builddir
+
+release_build:
+	meson --wipe builddir -Db_ndebug=true --buildtype release
+	meson compile -j 4 -C builddir
+
+debug_build:
+	meson setup --wipe builddir -Db_ndebug=true --buildtype debugoptimized
+	meson compile -j 4 -C builddir
+
+run: build
+	./builddir/sfmldemo.exe
+
+debug: build
+	gdb --nx -x .gdbinit --ex run --args builddir/runtests.exe
+
+debug_run: build
+	gdb --nx -x .gdbinit --batch --ex run --ex bt --ex q --args builddir/sfmldemo.exe
+
+clean:
+	meson compile --clean -C builddir