BuildSystem: Move all userpace libraries under the userspace directory

As the number of libraries is increasing, root directory starts to
expand. This adds better organization for libraries

userspace/libraries/LibFont/Font.cpp

@@ -0,0 +1,77 @@
+#include <BAN/ScopeGuard.h>
+
+#include <LibFont/Font.h>
+#include <LibFont/PSF.h>
+
+#if __is_kernel
+#include <kernel/FS/VirtualFileSystem.h>
+#endif
+
+#include <fcntl.h>
+
+#if __is_kernel
+extern uint8_t _binary_font_prefs_psf_start[];
+extern uint8_t _binary_font_prefs_psf_end[];
+#endif
+
+namespace LibFont
+{
+
+#if __is_kernel
+	BAN::ErrorOr<Font> Font::prefs()
+	{
+		size_t font_data_size = _binary_font_prefs_psf_end - _binary_font_prefs_psf_start;
+		return load(BAN::ConstByteSpan(_binary_font_prefs_psf_start, font_data_size));
+	}
+#endif
+
+	BAN::ErrorOr<Font> Font::load(BAN::StringView path)
+	{
+		BAN::Vector<uint8_t> file_data;
+
+#if __is_kernel
+		{
+			auto inode = TRY(Kernel::VirtualFileSystem::get().file_from_absolute_path({ 0, 0, 0, 0 }, path, O_RDONLY)).inode;
+			TRY(file_data.resize(inode->size()));
+			TRY(inode->read(0, BAN::ByteSpan(file_data.span())));
+		}
+#else
+		{
+			char path_buffer[PATH_MAX];
+			strncpy(path_buffer, path.data(), path.size());
+			path_buffer[path.size()] = '\0';
+
+			int fd = open(path_buffer, O_RDONLY);
+			if (fd == -1)
+				return BAN::Error::from_errno(errno);
+			BAN::ScopeGuard file_closer([fd] { close(fd); });
+
+			struct stat st;
+			if (fstat(fd, &st) == -1)
+				return BAN::Error::from_errno(errno);
+			TRY(file_data.resize(st.st_size));
+
+			ssize_t total_read = 0;
+			while (total_read < st.st_size)
+			{
+				ssize_t nread = read(fd, file_data.data() + total_read, st.st_size - total_read);
+				if (nread == -1)
+					return BAN::Error::from_errno(errno);
+				total_read += nread;
+			}
+		}
+#endif
+
+		return load(BAN::ConstByteSpan(file_data.span()));
+	}
+
+	BAN::ErrorOr<Font> Font::load(BAN::ConstByteSpan font_data)
+	{
+		if (is_psf1(font_data))
+			return TRY(parse_psf1(font_data));
+		if (is_psf2(font_data))
+			return TRY(parse_psf2(font_data));
+		return BAN::Error::from_errno(ENOTSUP);
+	}
+
+}