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/getopt/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(SOURCES
+	main.cpp
+)
+
+add_executable(getopt ${SOURCES})
+banan_include_headers(getopt ban)
+banan_link_library(getopt libc)
+
+install(TARGETS getopt OPTIONAL)

userspace/programs/getopt/main.cpp

@@ -0,0 +1,44 @@
+#include <BAN/String.h>
+#include <BAN/Vector.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+	if (argc < 2)
+	{
+		fprintf(stderr, "usage: %s OPTSTRING [PARAMETERS]...", argv[0]);
+		return 1;
+	}
+
+	BAN::Vector<char*> argv_copy(argc - 1);
+	argv_copy[0] = argv[0];
+	for (int i = 2; i < argc; i++)
+		argv_copy[i - 1] = argv[i];
+
+	int opt;
+	BAN::String parsed;
+	while ((opt = getopt(argc - 1, argv_copy.data(), argv[1])) != -1)
+	{
+		if (opt == ':' || opt == '?')
+			continue;
+
+		MUST(parsed.append(" -"));
+		MUST(parsed.push_back(opt));
+
+		if (optarg)
+		{
+			MUST(parsed.push_back(' '));
+			MUST(parsed.append(optarg));
+		}
+
+		optarg = nullptr;
+	}
+
+	printf("%s --", parsed.data());
+	for (; optind < argc - 1; optind++)
+		printf(" %s", argv_copy[optind]);
+	printf("\n");
+
+	return 0;
+}