Keeper management modernisation and improvements

* use a std::variant to manage the distinction between one or more keeper states. Use std::unique_ptr<Keeper[]> to manage the multiple keeper case.
* setting "nb_keepers" renamed "nb_user_keepers", to indicate these are in addition to internal keeper #0 used for timers.
* stricter lanes.linda() argument checking. group is imposed if more than one keeper is used.
* more tests

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lane.cpp b/src/lane.cpp
index 22147f1..029efdb 100644
--- a/src/lane.cpp
+++ b/src/lane.cpp
@@ -811,7 +811,7 @@ void Lane::changeDebugName(int const nameIdx_)
     kLaneNameRegKey.setValue(L, [idx = _nameIdx](lua_State* L_) { lua_pushvalue(L_, idx); });      // L: ... "name" ...
     // keep a direct pointer on the string
     debugName = lua_tostringview(L, _nameIdx);
-    if constexpr (HAVE_DECODA_NAME()) {
+    if constexpr (HAVE_DECODA_SUPPORT()) {
         // to see VM name in Decoda debugger Virtual Machine window
         lua_pushvalue(L, _nameIdx);                                                                // L: ... "name" ... "name"
         lua_setglobal(L, "decoda_name");                                                           // L: ... "name" ...