Adds more tests for CalculateOrderQuantity
Adds more tests for CalculateOrderQuantity

Includes a few tests with different initial and maintenance margins

andrewhart098/Lean,squideyes/Lean,bizcad/Lean,Jay-Jay-D/LeanSTP,mabeale/Lean,StefanoRaggi/Lean,mabeale/Lean,kaffeebrauer/Lean,squideyes/Lean,FrancisGauthier/Lean,jameschch/Lean,QuantConnect/Lean,AnshulYADAV007/Lean,squideyes/Lean,Mendelone/forex_trading,tomhunter-gh/Lean,AlexCatarino/Lean,QuantConnect/Lean,AnshulYADAV007/Lean,jameschch/Lean,StefanoRaggi/Lean,QuantConnect/Lean,kaffeebrauer/Lean,Mendelone/forex_trading,Jay-Jay-D/LeanSTP,mabeale/Lean,JKarathiya/Lean,redmeros/Lean,jameschch/Lean,kaffeebrauer/Lean,kaffeebrauer/Lean,kaffeebrauer/Lean,StefanoRaggi/Lean,devalkeralia/Lean,tomhunter-gh/Lean,devalkeralia/Lean,AlexCatarino/Lean,JKarathiya/Lean,devalkeralia/Lean,young-zhang/Lean,Phoenix1271/Lean,bizcad/Lean,redmeros/Lean,jameschch/Lean,AnshulYADAV007/Lean,young-zhang/Lean,AnObfuscator/Lean,Jay-Jay-D/LeanSTP,Phoenix1271/Lean,mabeale/Lean,andrewhart098/Lean,AnObfuscator/Lean,Mendelone/forex_trading,young-zhang/Lean,Mendelone/forex_trading,andrewhart098/Lean,young-zhang/Lean,AnshulYADAV007/Lean,jameschch/Lean,Phoenix1271/Lean,AlexCatarino/Lean,redmeros/Lean,AnObfuscator/Lean,QuantConnect/Lean,Jay-Jay-D/LeanSTP,squideyes/Lean,StefanoRaggi/Lean,Jay-Jay-D/LeanSTP,AnshulYADAV007/Lean,FrancisGauthier/Lean,JKarathiya/Lean,AnObfuscator/Lean,bizcad/Lean,tomhunter-gh/Lean,redmeros/Lean,devalkeralia/Lean,FrancisGauthier/Lean,tomhunter-gh/Lean,Phoenix1271/Lean,bizcad/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,andrewhart098/Lean,FrancisGauthier/Lean,JKarathiya/Lean