Remove Java files from spec via uml lecture (using C++ in 2018)

Lectures/L26_SpecViaUML/src/BankAccount.java

Lectures/L26_SpecViaUML/src/BankAccountInterface.java

Lectures/L26_SpecViaUML/src/DataSet.java

Lectures/L26_SpecViaUML/src/DataSetBankAccount.java

Lectures/L26_SpecViaUML/src/DataSetInterface.java

Lectures/L26_SpecViaUML/src/DataSetPoint.java

Lectures/L26_SpecViaUML/src/DataSetStrategy.java

Lectures/L26_SpecViaUML/src/DataSetStrategyTest.java

Lectures/L26_SpecViaUML/src/DataSetTest.java

Lectures/L26_SpecViaUML/src/Measurable.java

Lectures/L26_SpecViaUML/src/Measurer.java

Lectures/L26_SpecViaUML/src/PointT.java

Lectures/L26_SpecViaUML/src/PointTInterface.java

Lectures/L26_SpecViaUML/src/RectangleMeasurer.java

Lectures/L26_SpecViaUML/src/TestArraysSortComparable.java