Feature/soesv3

[hefloryd]

This pull request contains the following major changes:

• support for dynamic pdos, i.e. pdos that can be written in runtime
• sample application for dynamic pdos
• setting of default values when entering PREOP (fixes #5)
• possibility to be notified of transitions to error state (fixes #45)

Because API:s have changed the version is bumped to 3.0.0.

[hefloryd]

Changed pre_object_download_hook to return uint32_t instead of int as the return value is a COE abort code.

[hefloryd]

• Added set_defaults_hook to all applications
• Fixed sizeofPdo when mapping contained padding elements
• In sizeOfPdo, always set nmappings output value