Ignore PyCharm config.

rhaleblian uses PyCharm to do Git diff/merge.
Make exporting work again.
Use the true niflib DLL and lib output locations.

There may be an ambiguity in the niflib lib filename when building x64.
If so, it would be good to amend niflib.
Normalize solution launch scripts.
Ignore installer executables.
Add combined installer for 2012-2015.
Fix linkage for win32.
Rename plugin filename via plugin project.
Ignore more files.
Add script that builds all release versions.
Do not install CHM help.

It's very out of date.