Some minor bug fixes and enhancements to the OSCMessage class

- Fixed a boundary case when sending blob data that is already 32-bit al...igned along with additional parameters.
- Removed code to try and skip padding at the end of the types list when filling a message. I think the types list is just a null-terminated string, which doesn't include padding to align it to 32-bits, similar to the address.
- Added getDataCount method to OSCMessage
- Added getAddressLength method to OSCMessage
- Minor tweaks to buffer management for clarity