Fix Camel Case names and other fixes

[Marinovsky]

Description

The API has been standardized to return property names in camel case, except for the keys in Backtest.statistics and Backtest.runtimeStatistics. Thus, these changes document that standardization. Besides, some properties are deprecated so they are being removed. Finally, there were some missing properties that are being added in this PR.

Related Issue

N/A

Motivation and Context

With these changes, the docs will match the API responses

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] Refactor (non-breaking change which improves implementation)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Non-functional change (xml comments/documentation/etc)

Checklist:

• [x] My code follows the code style of this project.
• [x] I have read the CONTRIBUTING document.
• [x] My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>