Dart 2.0 compatibility

[nickclmb]

Hey, can you please make it compatible with d20:

[SEVERE] DDC builder on package:otdartlib/.package.module Error compiling dartdevc module:otdartlib|lib/.package.ddc.js

[error] The function expression type '(Map<dynamic, dynamic>) → void' isn't of type '(dynamic) → void'. This means its parameter or return type does not match what is expected. Consider changing parameter type(s) or the returned type(s). (package:otdartlib/src/ottypes/bootstrap_transform.dart, line 43, col 27)
[error] The function expression type '(Map<dynamic, dynamic>) → void' isn't of type '(dynamic) → void'. This means its parameter or return type does not match what is expected. Consider changing parameter type(s) or the returned type(s). (package:otdartlib/src/ottypes/bootstrap_transform.dart, line 44, col 27)
[error] The argument type '(Map<dynamic, dynamic>) → Map<dynamic, dynamic>' can't be assigned to the parameter type '(dynamic) → dynamic'. (package:otdartlib/src/ottypes/json0.dart, line 70, col 43)
[error] The function expression type '(Map<dynamic, dynamic>) → bool' isn't of type '(dynamic) → bool'. This means its parameter or return type does not match what is expected. Consider changing parameter type(s) or the returned type(s). (package:otdartlib/src/ottypes/json0.dart, line 74, col 18)
[error] The argument type '(Map<dynamic, dynamic>) → Null' can't be assigned to the parameter type '(dynamic) → void'. (package:otdartlib/src/ottypes/text0.dart, line 74, col 16)
[error] The function expression type '(Map<dynamic, dynamic>) → void' isn't of type '(dynamic) → void'. This means its parameter or return type does not match what is expected. Consider changing parameter type(s) or the returned type(s). (package:otdartlib/src/ottypes/text0.dart, line 122, col 17)
[error] The argument type '(Map<dynamic, dynamic>) → Null' can't be assigned to the parameter type '(dynamic) → void'. (package:otdartlib/src/ottypes/text0.dart, line 135, col 20)
[error] The function expression type '(int, Map<dynamic, dynamic>) → int' isn't of type '(int, dynamic) → int'. This means its parameter or return type does not match what is expected. Consider changing parameter type(s) or the returned type(s). (package:otdartlib/src/ottypes/text0.dart, line 182, col 30)
[error] The argument type '(Map<dynamic, dynamic>) → Map<dynamic, dynamic>' can't be assigned to the parameter type '(dynamic) → dynamic'. (package:otdartlib/src/ottypes/text0.dart, line 260, col 43)

Please fix all errors before compiling (warnings are okay).

[dmitryuv]

hi, we have internal fork compatible with 2.0, will push update within few days.