Neo Compiler CSharp Feedbacks

[cloud8little]

This issue is opened for all feedbacks for the new developed CSharp compiler.

[ToBeAdded]

• [x] #499 Support ByteString explicit cast for BigInteger type
• [x] #501 Support array foreach
• [x] #502 Support ToByteArray() overload
• [x] #503 Storage Find with RemovePrefix Option only remove One Byte
• [x] #521 Support Extended Method for type
• [x] #527 Check null should return
• [x] #539 nccs provides no error location information
• [x] #540 nccs doesn't pick up CS file from parent folder specified in .csproj file
• [x] #541 nccs can't compile contract w/ custom attribute on method
• [x] #549 nccs should accept multiple .cs files on the command line
• [ ] #550 nccs should support /reference command line option like csc.exe
• [ ] #551 Create NccsTask for MSBuild
• [x] #560 Return help information when using nccs without any argument or option.

[devhawk]

Please add #539, #540 and #541

[devhawk]

@cloud8little I didn't realize that I could change your comment if I clicked on a check box! I accidently clicked on the #541, but I unclicked it.

[devhawk]

Please add #549, #550, #551

[devhawk]

Please add #566 and #567

[devhawk]

Please add #574

[shargon]

Only https://github.com/neo-project/neo-devpack-dotnet/issues/550 left, I close this to follow in #550