Add UEFI toggle to project properties #287

Job	Run time
build	3m 26s
test (BoxingTests.Kernel)	1m 44s
test (Cosmos.Compiler.Tests.TypeSystem.Kernel)	2m 18s
test (Cosmos.Compiler.Tests.Bcl.Kernel)	2m 52s
test (Cosmos.Compiler.Tests.Bcl.System.Kernel)	3m 37s
test (Cosmos.Compiler.Tests.Exceptions.Kernel)	1m 44s
test (Cosmos.Compiler.Tests.MethodTests.Kernel)	1m 41s
test (Cosmos.Compiler.Tests.SingleEchoTest.Kernel)	1m 45s
test (Cosmos.Kernel.Tests.Fat.Kernel)	3m 7s
test (Cosmos.Kernel.Tests.IO.Kernel)	1m 47s
test (SimpleStructsAndArraysTest.Kernel)	1m 48s
test (Cosmos.Kernel.Tests.DiskManager.Kernel)	1m 45s
test (GraphicTest.Kernel)	2m 8s
test (NetworkTest.Kernel)	52s
test (AudioTests.Kernel)	4m 6s
test (MemoryOperationsTest.Kernel)	1m 55s
test (ProcessorTests.Kernel)	1m 38s
	38m 13s

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