Motivation for changes:

Arch isnt too great at running on older python versions 😄

Detailed changes:

• replace all instances of time.clock with preferred_time which is either time.process_time if supported otherwise remains time.clock. This is detected by attempting to access time.process_time on module import and setting the module level variable preferred_clock accordingly

Addressed issues:

• Fixes time.clock DeprecationWarning under python3.7 #2265

Log and/or tests output (preferably both):

i have log output in the linked issue of the behaviour before this patch, the DeprecationWarnings are no longer present after this patch is applied