[2.15.3] Bug fixes

[2.15.3] Bug fixes

• Fixed generated problem file/tab name for the pre-parse preview
• Support for spaces in problem template pre-process command-line
• Demoted Jinja2 errors to parsing problems make it possible to edit the files
• Configuration selector menu shows current value
• Introduced configuration to disable the model hierarchy decorator (for perf reasons)
• Added PDDL3.1 undefined to syntax highlighting
• To address the Issue #49 confusion why the search debugger is not displaying anything, when a planning service is called, the extension will now show a warning message that the search debugger config switch is being ignored.
• Removed tips that were not effective at teaching how to use the more hidden features Issue #47 as suggested and fixed by @boramalper