Blender Git Loki

Cleanup: Rename public "bUnit" functions

This commit renames the functions in "BKE_unit.h` to be consistent
with the naming in the rest of blenkernel.

bUnit_AsString -> BKE_unit_value_as_string_adaptive
bUnit_AsString2 -> BKE_unit_value_as_string
bUnit_ReplaceString -> BKE_unit_replace_string
bUnit_ApplyPreferredUnit -> BKE_unit_apply_preferred_unit
bUnit_ToUnitAltName -> BKE_unit_name_to_alt
bUnit_ClosestScalar -> BKE_unit_closest_scalar
bUnit_BaseScalar -> BKE_unit_base_scalar
bUnit_IsValid -> BKE_unit_is_valid
bUnit_GetSystem -> BKE_unit_system_get
bUnit_GetBaseUnit -> BKE_unit_base_get
bUnit_GetBaseUnitOfType -> BKE_unit_base_of_type_get
bUnit_GetName -> BKE_unit_name_get
bUnit_GetNameDisplay -> BKE_unit_display_name_get
bUnit_GetIdentifier -> BKE_unit_identifier_get
bUnit_GetScaler -> BKE_unit_scalar_get
bUnit_IsSuppressed -> BKE_unit_is_suppressed

Differential Revision: https://developer.blender.org/D8828