Added constructors to tangible.build, more work on keyword argument parsing, added LS.tailcall.

build-everything.py

@@ -183,6 +183,14 @@ LUPREXBUILDTASK["type"] = "shell"
 LUPREXBUILDTASK["options"] = {}
 LUPREXBUILDTASK["options"]["cwd"] = f"{INTEGRATION}/luprex"
 
+#
+# Add a presentation { clear=true } to all build tasks.
+# 
+
+for task in WORKSPACE["tasks"]["tasks"]:
+    task["presentation"] = {}
+    task["presentation"]["clear"] = True
+
 #
 # Convert all launch configurations to lldb.
 #