Reverts some of the version 2.0 project functionality, as there are a
number of challenges around populating files for folders that don't have
project definitions, particularly if user attempts to load a folder that
is not a project folder after all but happens, e.g. to have a source
folder in it.
Restricts enumeration of files for the project to the project folder and
the SourcePath folder. This prevents problems where a project may be in
a folder with many subfolders which would take a long time to enumerate,
and avoids confusion where there are source-type files in other folders.
At the same time, sorts out forward slash vs backslash in paths. While
forward slash works in many scenarios, there are several filename
manipulation functions, such as ExpandFileName, which would build valid
but non-optimal paths when forward slashes were encountered, which
cascaded into files appearing to be different and presentation issues.
Relates to #9948. Starts basic support for v2.0 projects.
For all operating modes:
- Remove blank projects / untitled projects mode
- Add Open Project Folder buttons and links
- Remove Project Save As
- Render uses in-memory XML
- Upgrade to v2.0 project file (along with checks)
For v2.0 projects:
- Remove 'Add File to Project'
- Populate Files to list all files in folder (note: consider efficiency
here as currently files are parsed for subfile data)
- Version 2.0 project options and defaults
