Implemented custom sales and date time integration

[gbenziv]

xxxx

• Implement sales data
• Added Date submodule
• Added datetime utility
• Updated screen flow implementation

Pull Request Checklist

• [x] I have ensured that my commit message contains the Issue ID.
• [x] I have ensured that my commit message contains the feature/bugfix description.
• [ ] I have updated the documentation accordingly.
• [x] I have ensured my code follows the coding guidelines.
• [x] I have ran lint in my code locally prior to submission.
• [x] I have built my changes in local successfully.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #229 (ec93088) into master (78e87d4) will not change coverage. The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   94.10%   94.10%           
=======================================
  Files          63       63           
  Lines        1153     1153           
=======================================
  Hits         1085     1085           
  Misses         68       68           

Impacted Files	Coverage Δ
core/domain/accounting/accountingcontroller.cpp	19.04% <0.00%> (ø)
core/domain/employeemgmt/employeecontroller.cpp	95.95% <ø> (ø)
core/entity/saleitem.hpp	0.00% <ø> (ø)
utility/general.hpp	100.00% <ø> (ø)
core/domain/unittest/test_customermgmt.cpp	100.00% <100.00%> (ø)
core/domain/unittest/test_empmgmt.cpp	95.62% <100.00%> (ø)

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