#13 Some random comments from code

[Flávio Etrusco]

- Undo is buggy when dealing with Hard Tabs (when inserting text after EOL and
when trimming).

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//todo: remove SynEdit Clipboard Format?
//todo: in WordWrap mode, parse lines only once in PaintLines()
//todo: Remove checks for WordWrap. Must abstract the behaviour with the plugins instead.
//todo: Move WordWrap glyph to the WordWrap plugin.
//todo: remove fMBCSStepAside variable
//todo: remove fShowSpecChar variable
//todo: remove the several Undo block types?