Build system modernization

.gitignore

@@ -48,60 +48,15 @@ gmon.out
 doc
 GecodeReference.chm
 ChangeLog
-examples/all-interval
-examples/alpha
-examples/archimedean-spiral
-examples/bacp
-examples/bibd
-examples/bin-packing
-examples/black-hole
-examples/car-sequencing
-examples/cartesian-heart
-examples/colored-matrix
-examples/crew
-examples/crossword
-examples/crowded-chess
-examples/descartes-folium
-examples/dominating-queens
-examples/domino
-examples/donald
-examples/efpa
-examples/eq20
-examples/golden-spiral
-examples/golf
-examples/golomb-ruler
-examples/graph-color
-examples/grocery
-examples/hamming
-examples/ind-set
-examples/job-shop
-examples/kakuro
-examples/knights
-examples/langford-number
-examples/magic-sequence
-examples/magic-square
-examples/magic-square-partial
-examples/minesweeper
-examples/money
-examples/multi-bin-packing
-examples/nonogram
-examples/open-shop
-examples/ortho-latin
-examples/partition
-examples/pentominoes
-examples/perfect-square
-examples/photo
-examples/qcp
-examples/queen-armies
-examples/queens
-examples/radiotherapy
-examples/sat
-examples/schurs-lemma
-examples/sports-league
-examples/steel-mill
-examples/steiner
-examples/sudoku
-examples/sudoku-advanced
-examples/tsp
-examples/warehouses
-examples/word-square
+examples/*
+!examples/CMakeLists.txt
+!examples/*.cpp
+!examples/*.hpp
+!examples/*.hh
+test/test
+
+# Ignore build tree outputs (version metadata lives in top-level
+# gecode-version.m4).
+build/
+CMakeUserPresets.json
+CMakePresets.json.user