Run Parameters: Possible extensions

[zenogantner]

Some nice extensions to the run parameters in the settings:

1. The parameters for specific files should be additionally accessible from the "Run" menu, and maybe from the right-click menu of the specific document.
2. Typical/important interpreter arguments could be represented as check boxes, include directories as a string list, etc.
3. There could be a function to search for available Perl interpreters.

[zenogantner]

4. There should be a button that leads to dialog which allows users to change the environment variables.

[SvenDowideit]

this can use the same dialog and code as I've added for Debug Launch Parameters.