Add support for previewing several order types

[ssoper]

• Resolves Add support for previewing Condor orders #53
• Resolves Add support for previewing Spread orders #50
• Resolves Add support for previewing Equity orders #49
• Resolves Adopt an EtradeServiceError protocol #48
• Resolves Move comments in *Api.kt classes into KDoc supported @params #36

[codecov]

Codecov Report

Merging #54 (e92d0d6) into master (ce4275a) will increase coverage by 2.79%.
The diff coverage is 76.02%.

@@             Coverage Diff              @@
##             master      #54      +/-   ##
============================================
+ Coverage     73.15%   75.95%   +2.79%     
  Complexity       84       84              
============================================
  Files            21       24       +3     
  Lines          1453     1697     +244     
  Branches         80       90      +10     
============================================
+ Hits           1063     1289     +226     
- Misses          334      346      +12     
- Partials         56       62       +6     

Impacted Files	Coverage Δ
src/main/kotlin/brokers/etrade/services/Orders.kt	51.11% <ø> (ø)
...rokers/etrade/services/orderPreview/CallOptions.kt	95.00% <ø> (ø)
src/main/kotlin/brokers/etrade/api/AccountsApi.kt	60.41% <48.14%> (-0.21%)	⬇️
...in/brokers/etrade/interceptors/ErrorInterceptor.kt	81.81% <50.00%> (-1.52%)	⬇️
...in/brokers/etrade/services/orderPreview/Condors.kt	78.12% <78.12%> (ø)
src/main/kotlin/brokers/etrade/api/AlertsApi.kt	97.72% <94.44%> (ø)
...in/brokers/etrade/services/orderPreview/Spreads.kt	96.42% <96.42%> (ø)
src/main/kotlin/brokers/etrade/api/MarketApi.kt	100.00% <100.00%> (ø)
src/main/kotlin/brokers/etrade/api/OrdersApi.kt	86.77% <100.00%> (+0.66%)	⬆️
src/main/kotlin/brokers/etrade/services/Service.kt	82.92% <100.00%> (+4.13%)	⬆️
... and 4 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ce4275a...e92d0d6. Read the comment docs.