v7.1

version update

Added WebDriver BiDi compatibility tweaks:
- Added EnableBiDi method to WebCapabilities class [@hanamichi77777]
- Added additional option to WebJsonConverter class to prevent conversion of stringified numbers which affected BiDi realmId's
- Added link in ReadMe.md to @hanamichi77777's WebDriver BiDi test Github
Fixed buggy Option Selection methods in WebDriver/WebElement classes [@hanamichi77777]
- SelectByIndex
- SelectAll
- DeSelectByIndex
- DeSelectByVisibleText
- DeSelectByValue
- DeSelectAll
Added ScrollDownUntilExhausted method to WebDriver class to handle lazy-loading pages [@hanamichi77777]
Added following 'Wait' methods to WebDriver and WebElement classes (where applicable)
- WaitUntilIdleDOM - wait until HTML DOM is idle for specified container
- WaitUntilIdleNetwork - wait until Network is idle [@hanamichi77777, @dornech]
- WaitUntilIdleJQuery - wait until jQuery/Ajax is idle [@hanamichi77777, @dornech]
Added more diagnostic test_Select sub to test suite