Some lasso tool improvements

[IgorS]

I want to suggest some changes that speed up workflow:
1. Separate Hotkeys for "Polygonal" and "Freeform" lasso.
2. Fast double click/ or option command/ or shortcut that completes selection (like in Photoshop)

[support]

will be allowed in the nearest release, also lasso with ALT will be toggled to polygonal sam as in photoshop