Identifies .xml keyboards when building file list, then shows those
appropriately in the keyboard list. Also enables grouped actions such
as keyboard_compileall for those keyboards.
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
