Configured NBug to display exception

TODO: Where should NBug send the exception report? The GitHub issue tracker is not implemented for NBug...
Allow a few more lanes to be draws in revision grid
Corrected handling \No new line at the end
Enable stage selected lines for a new file
Fixed unstage selected lines for a new file
Enable reset selected lines for a new file
Minor changes
GetPlainText() method improved
FormCommit: add icon to Reset Changes button
Merge pull request #1341 from feinstaub/topic_icons_6

FormCommit: add icon to Reset Changes button
Icons: prepare new ones
GitUI: add new icons to resources
Icons for "recent repo" list and for "manage submodules"
Icons for submodules form
FormCommit: make stage / unstage buttons violet to have another color as the push / pull arrows
Merge pull request #1342 from feinstaub/topic_icons_7

Icons update for submodules / recent repo menu item / staging