implement (optional) storing of filename history when saving hip files

[johnnyquest]

http://www.sidefx.com/docs/houdini/hom/locations.html

Before Houdini saves the scene file, it will run HOUDINIPATH/scripts/beforescenesave.py if it exists

or maybe a before-save event handler would be better...

Also, handler on scene open: if file name differs from the top one on the list in the hip, add the name (i.e. for manually copied files)

• should save the same info as Stash qL SOP
• should save _HIP_SAVEPLATFORM, _HIP_SAVEVERSION variables too

---

also: houdini activity monitor

• open
• save
• save as
• create new asset
• ROP "Render" button press
• ... (what else that's important to log as activity?)

also: copy/paste history

• ctrl+C node copy should store metadata (hip file, date, user, machine, full original node path, etc)

• ctrl+V paste should paste metadata

• metadata should accumulate (==copy/paste history)

• implement these as shelf buttons (so the user can choose / remap keys)?

• or just replace copy/paste? that'd be great but it has to be a total bug-free replacement

qLib save/save-as: write an entry in the undo queue, marking the save

[johnnyquest]

this should be separate from qLib, maybe a qLib-datatracking module