Attempt to introduce a discount system into the system

[rez1dent3]

#117

• Pay
• Free pay
• Gift
• Taxing
• Free Pay + Discount
• Pay + Discount + Taxing
• Refund
• Add wallet price calculation

[codecov]

Codecov Report

Merging #119 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master   #119   +/-   ##
=======================================
  Coverage       100%   100%           
- Complexity      235    240    +5     
=======================================
  Files            23     23           
  Lines           640    658   +18     
=======================================
+ Hits            640    658   +18

Impacted Files	Coverage Δ	Complexity Δ
src/Objects/Cart.php	100% <100%> (ø)	18 <2> (ø)	⬇️
src/Traits/HasWallet.php	100% <100%> (ø)	21 <0> (ø)	⬇️
src/WalletServiceProvider.php	100% <100%> (ø)	1 <0> (ø)	⬇️
src/Traits/HasGift.php	100% <100%> (ø)	6 <0> (ø)	⬇️
src/Traits/MorphOneWallet.php	100% <100%> (ø)	2 <0> (ø)	⬇️
src/Services/WalletService.php	100% <100%> (ø)	18 <3> (+3)	⬆️
src/Objects/Bring.php	100% <100%> (ø)	19 <2> (+2)	⬆️
src/Traits/CartPay.php	100% <100%> (ø)	24 <0> (ø)	⬇️
src/Services/CommonService.php	100% <100%> (ø)	21 <0> (ø)	⬇️
src/Traits/CanExchange.php	100% <100%> (ø)	8 <0> (ø)	⬇️
... and 4 more

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