Parameter documentation, rename two props for clarity.
Minor in level checks
Lots of stuff in here:

* Fixed _displayErrors() raising an exception is an exception was not
actually raised
* Further variable renaming for consistency with two commits ago
* Add `PermissionError` exception handling to _writeFile()
* Minor tweaks to PermissionError dialog text
* Fixed an issue with new level template being two lines short in syntax
checks
+ Restore new level saving
* Refactored saveLevel() to enable new level saving
Remove old saveNewLevel() function,

block comment saveLevel() function (for now)
The Blocks.bat file may have been only used

in the 0.9.1 release, but that is the only release it will be used in.
It is not in my best interest to have such a launcher anymore, and as
such it is going away in the 1.0.0 release.
Add long versions of command-line arguments,

update change log