[ENH] Split file parsing by file type, allowing unique regex and link creation
[ENH] Support USDC in Commands > Diff File... action
[ENH] Improve USDZ asset resolution
[MNT] Logging, documentation, and cross-platform compatibility updates
[BUG] use python3-compatible write method
[BUG] resolve libpng warning: iCCP: known incorrect sRGB profile
[BUG] bool preferences not evaluating on macOS

Signed-off-by: mds-dwa <mark.sandell@dreamworks.com>

[ENH] Minor text editor optimization by subclassing QPlainTextEdit
[ENH] Active line highlighted in browser and editor
[ENH] Ctrl+F shortcut auto-populates Find field with active cursor selection
[ENH] Cleanup toolbar look on Mac, and reduce space taken up by Ctrl+F Find bar
[ENH] Support jumping to line number from link within the current file
[BUG] Line numbers overlap when zooming out
[MNT] Add 'nonlocal' python3 keyword for syntax highlighting
[MNT] Revamp Find "highlight all" logic to work with active line highlighting
[MNT] Moving more tab logic to the class responsible for them
[MNT] Documentation cleanup

…nager into python3

Conflicts:
	.gitignore
	usdmanager/__init__.py
	usdmanager/images_rc.py
	usdmanager/parsers/usd.py

…nager into python3

… into python3

… into python3

Conflicts:
	usdmanager/parser.py
	usdmanager/utils.py

- Windows links to drive-based files need three leading slashes
- Ar 2.0 no longer has `AnchorRelativePath`; replace w/ `CreateIdentifier`
- expandPath returns a `ResolvedPath` that needs to be converted to
  string before being passed to python in a couple of places

Signed-off-by: Gary Oberbrunner <garyo@darkstarsystems.com>

Updates for Windows & Ar 2.0: ResolvedPath, Win drive letters

[MNT] add docstrings, cleanup whitespace and formatting, rm unused code
[MNT] previously deprecated setDirtyTab removed
[ENH] python3 compatibility for setup.py
[BUG] ensure app tmp dir exists if manually removed while open
[BUG] set file dialog starting directory to cwd on launch
[BUG] Save As shouldn't append a dot with no extension
[BUG] disable Open button in include panel when nothing selected

Signed-off-by: mds-dwa <mark.sandell@dreamworks.com>

Signed-off-by: Mark Sandell <mdsandell@gmail.com>

Issue #31: cast round to int