Add fluid_player_get_status and fix some typing bugs

[Fruchtzwerg94]

Fixed the data type for synth.sample rate according to the documentation to float. This removes the error:

Also:

• added fluid_player_get_status
• fixed int return for fluid_player_add

[trenslow]

@filipeborato any chance we can get these changes released in the near future?

[filipeborato]

@trenslow I don't have the power to merge, but I tested it and it looks ok.

[trenslow]

@filipeborato sorry, i naively assumed you had the power to merge since you approved the changes. how can we get the changes merged?

[albedozero]

Thanks! Sorry to take so long to get to this. I changed the title to reflect the adding of a new function binding, since this is a bigger change than bugfixes.

fixes https://github.com/nwhitehead/pyfluidsynth/issues/37

[trenslow]

Thanks a million @albedozero! I appreciate the work you guys are doing on this project.

[TombCrawler]

I've done all the change by [Fruchtzwerg94 but still got the same issue. Anyone?