Collect hashtags. Fixes and improvements.

Fixed the open-item and select-line feature. It's not perfect (should be done using the editor notifications and delegates) but now it works.

Removed a step from the bash pipe using a reg exp to extract the type and content of the lines instead of splitting by colons.

Search for 3 letters hashtags instead of TODO:, etc. All 3rd party libraries have tons of FIXME, TODO, etc.  making the plugin unusable.  Instead of excluding those files (that should be done anyway) I search for short hashtags that I use to tag the source during development. I remove them before the final commit.

Open item when the cell is clicked, ignoring its selection state.  Otherwise if you select an item, close the file or just move around, you can't click the same item again.