Draft - enabled utf8 in coin3d and svg - relates to issue #1404
Spreadsheet: property controller - fixes #926

Added a new object and tool called property controller, which
must be added to a spreadsheet and gives the value of a cell to
a property of an object.
Spreadsheet: small fix
Spreadsheet: Allow to control sketches datum values
Draft: fixes in offset
+ Fix crash when editing the linear pattern feature, suppress some warnings in release mode
+ fix possible crashes in mirror and polar pattern feature
Arch: Converted wall tool to units system
Arch: fixed a text in Arch preferences
Arch: cosmetic improvements in wall and prefs