Improve subclassing support

[0xc010d]

This patch resolves some common cases which you could get with subclassing. The most difficult case is:

Class A (lazy base class):

@interface A : NSObject <BMLazy>
@property (strong) NSString *a;
@end

@implementation A
@dynamic a;
@end

Class B (non-lazy subclass):

@interface B : A
@property (strong) NSString *b;
@end

@implementation B
@dynamic b;
@end

Class C (lazy subclass with lazy super-super):

@interface C : B <BMLazy>
@property (strong) NSString *c;
@end

@implementation
@dynamic c;
@end

In that case, collected lazy properties for C are a and c.

[AlexDenisov]

Core should knew nothing about concrete protocols.

[AlexDenisov]

@0xc010d, here is my vision about how it should be, but currently it's very inefficient.
#4

P.S. we should determine coding style 😸