Adding support for text comparison with LCS algorithm

src/main/java/avatartranslator/AvatarBlock.java

src/main/java/myutil/Conversion.java

src/main/java/ui/AvatarPanelDrawer.java

src/main/java/ui/MainGUI.java

src/main/java/ui/window/JFrameSysMLv2.java

ttool/src/test/java/myutil/ConversionTest.java

ttool/src/test/java/test/AbstractTest.java

ttool/src/test/java/ui/AbstractUITest.java

ttool/src/test/resources/conversion/diff/text0

ttool/src/test/resources/conversion/diff/text1

ttool/src/test/resources/conversion/diff/text1_0

ttool/src/test/resources/conversion/diff/text1_1

ttool/src/test/resources/conversion/diff/text2_0

ttool/src/test/resources/conversion/diff/text2_1