BuildSystem: Cleanup userspace directory layout

userspace programs are now in userspace/programs
userspace tests are now in userspace/tests

This makes listing userspace projects much cleaner. Libraries were
already separated to their own directory, so other programs should also.

userspace/programs/touch/CMakeLists.txt

@@ -0,0 +1,8 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(touch ${SOURCES})
+banan_link_library(touch libc)
+
+install(TARGETS touch OPTIONAL)

userspace/programs/touch/main.cpp

@@ -0,0 +1,17 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+	int ret = 0;
+	for (int i = 1; i < argc; i++)
+	{
+		if (creat(argv[i], 0644) == -1 && errno != EEXIST)
+		{
+			perror(argv[i]);
+			ret = 1;
+		}
+	}
+	return ret;
+}