Implemented a CustomGUI and CustomDataType plugin
called the "Floatlist" for ingvarai from the PluginCafe.
It demonstrates how a CustomDataType can be implemented
and displayed using a CustomGUI. The only thing we are yet
missing is that the description sub-channels are displayed
correctly in the AM and are accessible via XPresso.
changed default value of a newly added item to 0.0
added floatlist description and example image
updated Floatlist example, each row has now its own delete button
moved floatlist from customgui/ to datatype/
Merge branch 'master' into datatype/floatlist
added resource symbol IDS_MULTIPLEVALUES and US stringtable. updated Makefile so we can #include <res/c4d_symbols.h>. displaying multiple values with the Floatlist Custom GUI works correctly now, the m_count must be initialized with 0.
merged master into current branch
fixes #2. the change introduced in commit 09f198ce followed that `FloatlistGui::Rebuild()` stops
before doing the actual GUI rebuilding when the data assigned with `FloatlistGui::SetData()`
contained zero elements as m_multiple was false and m_count was equal to
`FloatList::GetCount()`.

`FloatlistGui::m_count` is now initialized with -2. When checking if we have already built
the layout to display the "Multiple Values" string, we compare against -1 which is assigned
to `m_count` when `m_multiple` was true in `Rebuild()`.
Merge pull request #3 from PluginCafe/datatype/floatlist

Merging the datatype/floatlist example into the master