added Load Families.pushbutton

[hikib]

New bundle to load families from a directory, recursively.
Related to issue #1015 .

Workflow

1. Select a directory.
2. Select Families (*.rfa files) from the directory.
3. Select loading option (load all Types OR select Type(s) for each Family)
   (4. Select Family Type(s) for each Family)

Notes on bundle

• Tested on Revit 2019, 2020 with up to 450 families, loading all types.
• Reports at the end about families that were already loaded (if family name exists in project).
• If user decides on selecting types for each family, single type families will be loaded without prompt.
• Excludes backup files (xxx.0001.rfa)
• Has progress bar with cancel button and count.

Notes on the code

• pathlib module to find files recursively by globbing
  • pathlib is part of the standard lib of python since v3.4. Can be replaced with os.walk or os.path.walk, depending on python version.
• itertools.ifilterfalse to filter out backup files. Can be replaced by re.match.

[hikib]

I moved the pushbutton into a new pulldown with 'Load More Types'.
The pulldown is missing an icon. Any suggestions are welcome and i´ll add it in a commit with other changes after more reviews.

[eirannejad]

Uh sweet!

[eirannejad]

Merged for review

[eirannejad]

Merged into develop and will be published with v4.8.4