The Config Wizard now just copies the Vendor's Config Bundle
into user_dir/vendor/ directory and Slic3r uses the configs
from the bundles found in user_dir/vendor directly.
The previous way of checking that _putenv_s is defined does not work,
because _putenv_s is a function and not a define. This is a partial
application of commit 31115e0369747b1e1c45cbe3f2a90f6dff66666a from
alexrj/Slic3r.
I tried cherry picking the whole commit, but unicode is already handled
diffrently here, so that would have been a lot of work.
The values of StaticPrintConfig derived objects were searched by a name
walking through a huge chained if.
Now they are being mapped with a std::map.
Also initialization of StaticPrintConfig classes from their ConfigOptionDef
defaults is done by maintaining a single global definition of each
StaticPrintConfig derived class, and a new instance is initialized
from this static copy.
Also the ConfigOption instances are casted using static_cast
wherever possible, and their types are verified by a virtual type() method.
This approach avoids insiginificant performance penalty of a dynamic_cast.
Also the compare and clone methods were added to ConfigOption,
and the cloning & compare work on binary values, not by serialization.
Added "filament_max_volumetric_speed", a cap on the maximum volumetric
extrusion role, filament specific. This is very useful when mixing
rigid filament with a soft filament.
Extended the import / export of multi-string values into configuration
values, including the test cases. Multi-line strings will be enclosed
into quotes, quotes escaped using a C-style escape sequences. Single
word strings could still be stored without quotes.
