Update the SET, tag and schedule APIs and deprecate old ones

[housengw]

This PR updates the SET, tag and schedule APIs with new signatures and deprecated out-of-date ones.

Specifically, the following renames are performed:

Format:

1. old name -> new name means that the API is renamed from old name to new name. old name is still available in the current release, but will be removed in a future release.
2. old name (deprecated) means that the old name has not been renamed, and will be removed in a future release.
3. new name (new) means that the API is introduced in the linked PR.

• SET related APIs:
  • SET -> lf_set
  • SET_ARRAY (deprecated)
  • SET_NEW (deprecated)
  • SET_NEW_ARRAY (deprecated)
  • SET_PRESENT (deprecated)
  • SET_TOKEN -> lf_set_token
  • SET_MODE -> lf_set_mode
  • lf_set_destructor (new)
  • lf_set_copy_constructor (new)
• schedule related APIs:
  • schedule -> lf_schedule
  • schedule_int -> lf_schedule_int
  • schedule_token -> lf_schedule_token
  • schedule_copy -> lf_schedule_copy
  • schedule_value -> lf_schedule_value
  • check_deadline -> lf_check_deadline
• tag_t related APIs (WIP):
  • lf_tag() (new)
  • lf_time(lf_time_flag flag) (new)
  • compare_tags -> lf_compare_tags
  • get_elapsed_logical_time -> lf_time(LF_ELAPSED_LOGICAL)
  • get_logical_time -> lf_time(LF_LOGICAL)
  • get_current_tag -> lf_tag
  • get_microstep (deprecated)
  • get_physical_time -> lf_time(LF_PHYSICAL)
  • get_elapsed_physical_time -> lf_time(LF_ELAPSED_PHYSICAL)
  • set_physical_clock_offset -> lf_set_physical_clock_offset
  • get_start_time -> lf_time(LF_START)

These are copied from lf-lang/lingua-franca#1108.
Please refer to that issue for the most up-to-date information

[edwardalee]

This is nicely done with the _Pragma's for issuing warnings. I didn't know about that trick.

This is a unique opportunity to change the names of all these to something less likely to conflict, like lf_set.

Also, it will be a tedious job, but all the tests and documentation examples will need to be changed.

Let's discuss to settle on the naming.