Started work on RegExp to FA.
Some little changes. Removing bugs.

Need to propperly remove nodes and connect formal to graphic automata.
Now failing when delete first node.
First prototipe of RE -> FA!!!

Delete node bug repair.
Need to rapair broken arrows.
Need to fix function to elipse line intersect.
Repaired arrow!
Removed debug messages and debug window in Windows.
Added selection regexp node and visualize its automats.
Many changes, need to rewrite this comment.

* repaired minimalization algorithm
* re -> fa is broken dont now why. Unit tests failing on this conversion... Need to investigate.
Basic operation on first conversion DONE!

* Next step is good debug if found some errors.
* Next step is also add advanced features.
Repaired bug and check if FA is empty or wrong.

* When checking equivalence FA without start state or final states there was bugs in algorithms which cant work with this non ended FA.
* When Finite automata is empty there is special icon with excremention mark (not false icon).
Refaktoring. Add first example. Bug repair.

Repaired bug in function QModelIndex RegExpTreeModel::indexFromNode(RegExpNode *node) const!
Added RegExp to FA Examples and bug repair.

Also added:
 * RegExpToFa refactoring and add support for advanced and more user friendly logic.
 * Add empty RegExp functionality as empty set prepresented by empty set sybmol.
 * Finite automata:
	* new function bool hasEpsilon()
        * bug repair in function FiniteAutomata FiniteAutomata::toMinFA(FiniteAutomata FA)
 * Programmaly check action so user can see which mode was selected.
 * Add new unit test for RegExp("a+b") to FA
Some bug fixes and added icon and improve appereance.

 * Added icons to FA editor.
 * Disable not implemented buttons.
 * Clean project form old debug messages.
 * Refactor, repair and improve changing modes logic.
 * Repair NextStep and PrewStep functionality from unexpected SEGFAULT crashes.
 * Refactor and simplyfi RegExpToFA algorithm class.
 * Automatically select root RegExp node. (This very improve user confort.)
 * When changing mode to PlayMode regexp tree is cleaned.
Comment clean.
Merge branch 'regexp_to_fa'