Introduce new class; KoInlineNote. This class is used to store data for foot-, and end notes inside the normal text flow.

The text plugin will use this to layout a footnote at the bottom of the shape it appeared in.

Its currently pretty primitive; but I'm pretty happy about the design as this fills a long standing feature request of allowing footnotes to be printed at the bottom of each column, instead of ignoring the columns.

As a side effect; this allows all applications to use footnotes, not just KWord.