fix for issue #144
fix for issue #144 (continued)
removed button Save All Files, because users may get confused about the difference wrt Save Project
additional edits for removing function Save All Files; function Save Selected File is now always enabled (useful for handling situations where a file is edited using an external editor and the user wants to re-save the file shown in the model editor)
additional fix for bug #141 (svg size not updated - merge from master)
fix for issue #145 + minor code cleanup
fix for issue #146 + minor code cleanup
additional fix for issue #145
fix for issue #142
minor changes to improve feedback given with notification messages
minor fix for widgets list (all widgets were erroneously highlighted as selected when opening a project)
patch that mitigates issue #121
fix to mitigate issue #98
introduced additional feedback for projects with missing image file / missing main file (partially addresses concerns highlighted in issue #98)
Merge commit '3b980343874b88e70308b9fda29fbb3c947533b1' into sourcecode-editor-plugin

* commit '3b980343874b88e70308b9fda29fbb3c947533b1':
  fix for issue #145 + minor code cleanup
  additional fix for bug #141 (svg size not updated - merge from master)
  additional edits for removing function Save All Files; function Save Selected File is now always enabled (useful for handling situations where a file is edited using an external editor and the user wants to re-save the file shown in the model editor)
  removed button Save All Files, because users may get confused about the difference wrt Save Project
  fix for issue #144 (continued)
  fix for issue #144

Conflicts:
	src/client/app/plugins/prototypebuilder/interface.js
Merge commit '7b07b1f140c6ab73d699df15998e7b9e4dfcc635' into sourcecode-editor-plugin

* commit '7b07b1f140c6ab73d699df15998e7b9e4dfcc635':
  introduced additional feedback for projects with missing image file / missing main file (partially addresses concerns highlighted in issue #98)
  fix to mitigate issue #98
  patch that mitigates issue #121
  minor fix for widgets list (all widgets were erroneously highlighted as selected when opening a project)
  minor changes to improve feedback given with notification messages
  fix for issue #142
  additional fix for issue #145
  fix for issue #146 + minor code cleanup

Conflicts:
	src/client/app/plugins/prototypebuilder/interface.js
	moved builder/simulator view switching code to prototype builder plugin