DlgSettingsGeneral.ui: hide unused option from dialog

AddonManager: Skip non-github addons

replace insecure use of eval() with proper use of units

improve mesh repair functions

FEM: ccx tools, set back the assignment of linux and osx ccx binary path

Fixes Bug 2034. Made Part dimensional arrows proportional to line len…

…gth and radius

fixes FreeCAD#3421: Duplicate workbench message

updated translations

+ use correct function to get resource directory

0001714: FreeCAD 0.14 Stable crashes when importing a step model