src: moved Java indexer from JavaSymbolSolver to Eclipse JDT

* added some more tests
* changed 3rd party licenses respectively

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java_indexer/src/main/java/com/sourcetrail/Position.java

@@ -0,0 +1,17 @@
+package com.sourcetrail;
+
+public class Position 
+{
+	public int line = 0;
+	public int column = 0;
+
+	public Position()
+	{	
+	}
+	
+	public Position(int line, int column)
+	{
+		this.line = line;
+		this.column = column;
+	}
+}