Menu update

[sepandhaghighi]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

• time_calc function added
• time_average_calc function added
• time_convert function modified
• get_input_standard function modified
• Menu updated
• Relax program renamed to Relax1
• 4-7-8 program renamed to Relax2
• 7-11 program renamed to Relax3

Any other comments?

[codecov-commenter]

Codecov Report

Merging #61 (128e237) into dev (0bb2df3) will increase coverage by 0.32%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev      #61      +/-   ##
==========================================
+ Coverage   96.03%   96.34%   +0.32%     
==========================================
  Files           2        2              
  Lines         176      191      +15     
  Branches       18       22       +4     
==========================================
+ Hits          169      184      +15     
  Misses          4        4              
  Partials        3        3              

Impacted Files	Coverage Δ
nafas/functions.py	95.28% <100.00%> (+0.50%)	:arrow_up:
nafas/params.py	100.00% <100.00%> (ø)

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[sepandhaghighi]

@sadrasabouri Please review this PR 🚀 If everything is okay, Squash/Merge it after approval 💯