Read and return all the content of this stream

Property definitions

android :: assets $ NativeInputStream :: read_all
	# Read and return all the content of this stream
	private fun read_all: JavaString in "Java" `{
		// `available` returns the n of bytes currently available, not the total.
		// This may cause problems in the future with large asset files.
		try {
			int size = self.available();
			byte[] bytes = new byte[size];
			self.read(bytes, 0, size);

			return new String(bytes);
		} catch (java.lang.Exception exception) {
			exception.printStackTrace();
			return null;
		}
	`}
lib/android/assets.nit:55,2--69,3