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/create_program.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+PROGRAM_NAME=$1
+
+mkdir $PROGRAM_NAME
+
+cat > $PROGRAM_NAME/CMakeLists.txt << EOF
+set(SOURCES
+	main.cpp
+)
+
+add_executable($PROGRAM_NAME \${SOURCES})
+banan_link_library($PROGRAM_NAME ban)
+banan_link_library($PROGRAM_NAME libc)
+
+install(TARGETS $PROGRAM_NAME)
+EOF
+
+cat > $PROGRAM_NAME/main.cpp << EOF
+#include <stdio.h>
+
+int main()
+{
+	printf("Hello World\n");
+}
+EOF