v7.2: fix various bugs; add "Check JSON syntax now" command

[7.2.0] - 2024-04-19

Added

1. Check JSON syntax now command.

Changed

1. Made it so that reloading the error form by pressing Enter would not cause certain message boxes to appear, to eliminate a potential "infinite" loop where the user would hit Enter to close the message box, and that moved focus back to the error form, which then repeated the cycle when they lifted the Enter key.
2. Automatic validation when auto_validate is true no longer opens the prompt asking if user wants to open the error form (if offer_to_show_lint is true), because that could cause Notepad++ to crash or hang forever (see issue 60).
3. Made it so that automatic JSON schema validation (that is, any validation not manually invoked by the plugin menu command) no longer causes the caret to move to the location of the first schema validation error.
4. Automatic validation (including non-schema validation) now refreshes the error form.

Fixed

1. Minor bug in PPrint remembering comments algorithm implementation that caused some arrays and objects to be compressed when they should have been pretty-printed.
2. Fix bug where tests could crash under some circumstances due to filesystem weirdness making it impossible to find test files.