Improve line wrapping handling

TerminalLine is aware of wrapping state, making multi-lines copy/paste
working properly.
Fix bug when resizing, filling current line with unwanted spaces.
Fix bug when resizing, where the end of current line is not cleared
properly in text buffer.
Triple-click line selection is aware of line wrapping
Merge branch 'master' into wrapped_line

Conflicts:
	src-terminal/com/jediterm/terminal/ui/TerminalPanel.java
Unwrap where needed
Merge pull request #49 from Plonk42/wrapped_line

Improve line wrapping handling