[2/4] richedit: Implemented paragraph selection

[Dylan Smith]

Paragraphs can be selected in native richedit controls by double
clicking on the selection bar.  This patch implements that behaviour.

I tried to take advantage of some of the similarities between selecting
lines and selecting paragraphs, so refactored the code to take advantage
of these similarities.  ME_LButtonDown should now be easier to read
since a lot of the code has been moved to ME_SelectByType.
---
 dlls/riched20/caret.c   |  101 ++++++++++++++++++++++++++++++----------------
 dlls/riched20/editor.h  |    2 +-
 dlls/riched20/editstr.h |    3 +-
 3 files changed, 69 insertions(+), 37 deletions(-)
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