Added tests for model swizzling/unswizzling

• Added P_001P001ModelTests, which currently tests models' swizzleDeallocForModelWillDie and unswizzleDeallocForModelWillDie.
• Since we need clean model classes to test this on, created two single-file basic BOOL-valued models (both interface and implementation) and put them in `P_001P001ModelTestsModel.inc` and `P_001P001ModelTestsModelWithoutDealloc.inc`, both of which are included into `P_001P001ModelTests.m`.
	• P_001P001ModelTestsModelWithoutDealloc is just like P_001P001ModelTestsModel, but without specified `- (void)dealloc` method.
	• Added to project with no Xcode-specified target inclusion (to avoid warnings).