Add `pysymoro/manipulator.py`
Fix event KILL_FOCUS bug

Fix event KILL_FOCUS bug that was caused when some text fields lost
focus. This was because the ID value of the textbox control was used to
access individual elements from Matrix (read as list). Since these ID
values were assigned using the default wxPython method they were mostly
negative values that was causing an `IndexError`.
The fix basically assigns custom ID values (mostly 0, 1, 2)  to those
textbox controls that require it and `-1` to those that don't depend on
ID values for any functionality. These ID values were set for each
field in the `symoroui/labels.py` file.