(API Change) Rename autoselect/default functions

For the sake of consistency, renamed these two functions to include
_value at the end so they are consistent.

Renamed:                         To:
-------------------------------------------------------
obs_data_has_default             obs_data_has_default_value
obs_data_has_autoselect          obs_data_has_autoselect_value
obs_data_item_has_default        obs_data_item_has_default_value
obs_data_item_has_autoselect     obs_data_item_has_autoselect_value