Typhoon crashes when its symbols are prefixed

[stnslw]

The issue occurs when symbol prefixing tool is used like described in the http://blog.sigmapoint.pl/avoiding-dependency-collisions-in-ios-static-library-managed-by-cocoapods/ It might also occur when using obfuscation tools.

The reason behind the crash is creation of objects using classes provided as strings, e.g.:

[self registerTypeConverter:[[TyphoonClassFromString(@"TyphoonUIColorTypeConverter") alloc] init]];

In this case class symbol gets prefixed but the string do not, which results in following crash:

2017-02-06 16:06:30.347 Typhoon-iOS[88470:2597541] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSDictionaryM removeObjectForKey:]: key cannot be nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010c2eed4b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x000000010bd5021e objc_exception_throw + 48
    2   CoreFoundation                      0x000000010c286de3 -[__NSDictionaryM removeObjectForKey:] + 675
    3   Typhoon-iOS                         0x0000000109522b63 -[__ONG_TyphoonTypeConverterRegistry registerTypeConverter:] + 595
    4   Typhoon-iOS                         0x0000000109523175 -[__ONG_TyphoonTypeConverterRegistry registerPlatformConverters] + 309
    5   Typhoon-iOS                         0x000000010952262f -[__ONG_TyphoonTypeConverterRegistry init] + 671
    6   Typhoon-iOS                         0x00000001095b9eff -[__ONG_TyphoonComponentFactory init] + 831
    7   Typhoon-iOS                         0x0000000109604e0a -[__ONG_TyphoonBlockComponentFactory initWithAssemblies:] + 282
    8   Typhoon-iOS                         0x0000000109604aec +[__ONG_TyphoonBlockComponentFactory factoryWithAssemblies:] + 300
    9   Typhoon-iOS                         0x00000001095d4491 +[__ONG_TyphoonStartup requireInitialFactory] + 977
    10  Typhoon-iOS                         0x00000001095d4aae __66+[__ONG_TyphoonStartup swizzleSetDelegateMethodOnApplicationClass]_block_invoke + 590
    11  UIKit                               0x0000000109fca375 _UIApplicationMainPreparations + 1747
    12  UIKit                               0x0000000109fc9c38 UIApplicationMain + 111
    13  Typhoon-iOS                         0x00000001095cf8ed main + 285
    14  libdyld.dylib                       0x000000010d37868d start + 1
    15  ???                                 0x0000000000000005 0x0 + 5
)
libc++abi.dylib: terminating with uncaught exception of type NSException

One way to fix it is to replace hardcoded string values with dynamically created ones, e.g.:

[self registerTypeConverter:[[TyphoonClassFromString(NSStringFromClass([TyphoonUIColorTypeConverter class])) alloc] init]];

Seems that those changes needs to be only done within registerPlatformConverters method of TyphoonTypeConverterRegistry since all Typhoon unit tests pass when prefixing is done when this method is fixed.

[etolstoy]

Thanks for your PR!