Fixed EndlessGrid not rendered in Custom Node. Problem is EndlessGrid's VM not knowing when to start

EndlessGridView only loaded should inform its EndlessGridViewModel about it,
then ViewModel is able trigger the first render.
Merge pull request #726 from l2obin/EndlessGridFix

Fixed EndlessGrid not rendered in Custom Node causing canvas control issues
search term updates
MAGN-551. Changed line and point colors to not multiply. Removed line stripping logic.
Merge branch 'master' of github.com:ikeough/Dynamo
MAGN-655. Remove tick snapping from number slider.
Merge branch 'master' into MAGN683