-Add BitStream::peekBits to read a sequence of bits from the buffer without advancing the read pointer.

git-svn-id: http://odamex.net/svn/root/branches/net3-base@4501 b0bcef46-2027-0410-bd56-ab726e9a1d04
-BitStream::readBit and peekBit should return a bool.
-Add a safety check to BitStream::readBits and peekBits to prevent reads over 32 bits in length.

git-svn-id: http://odamex.net/svn/root/branches/net3-base@4502 b0bcef46-2027-0410-bd56-ab726e9a1d04