ExternalProject: Improve documentation
- Added clearer structure by grouping the options into logical sections. - Expanded the details for many of the options. - Added Examples section to show how to use the various commands. - Specifically highlighted that the contents of SOURCE_DIR may be lost if a download method is also provided. - Updated argument-matching regex to be more robust and account for the varying leading spaces before keywords in the docs. - Updated tests to account for slightly changed error messages.
Showing with 827 additions and 380 deletions