🎨 Add Alpha Color support to DrawFilledRectangle #375

Job	Run time
build	5m 39s
test (BoxingTests.Kernel)	1m 46s
test (Cosmos.Compiler.Tests.TypeSystem.Kernel)	2m 21s
test (Cosmos.Compiler.Tests.Bcl.Kernel)	2m 54s
test (Cosmos.Compiler.Tests.Bcl.System.Kernel)	3m 42s
test (Cosmos.Compiler.Tests.Exceptions.Kernel)	1m 48s
test (Cosmos.Compiler.Tests.MethodTests.Kernel)	1m 46s
test (Cosmos.Compiler.Tests.SingleEchoTest.Kernel)	1m 49s
test (Cosmos.Kernel.Tests.Fat.Kernel)	3m 5s
test (Cosmos.Kernel.Tests.IO.Kernel)	1m 56s
test (SimpleStructsAndArraysTest.Kernel)	1m 47s
test (Cosmos.Kernel.Tests.DiskManager.Kernel)	1m 47s
test (GraphicTest.Kernel)	2m 12s
test (NetworkTest.Kernel)	59s
test (AudioTests.Kernel)	4m 12s
test (MemoryOperationsTest.Kernel)	1m 58s
test (ProcessorTests.Kernel)	1m 41s
	41m 22s

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