set pen/brush style for rubber band

alpha channel for color of digitizing rubber band

second rubberband to distinguish drawn vertices from next possible point in digitization
Add note that non-greedy regular expressions are not supported to function help
Merge pull request #798 from 3nids/maptoolcapturerubber

[fix #8395] Add a second rubber band in map tool capture
Updated list of IT translators
Fix untranslatable strings in qgsstylev2managerdialog.cpp
german translation update
translation update: da_DK and es