Remove Processing Filetype (.PDE extension)

[Dotrar]

referencing issue #838

This is really an annoying issue with these asking FOR pde support:
#217 #752 #793
but they are all individually wrong:
PDE is for processing, arduino uses INO. Arduino DID use pde prior to the first release ( as it was a cut-copy of Processing ) but now PDE on arduino is considered "read only" - read more here

Now with Ardiuno on 1.8.9 and Processing on 3.5.3; Both popular, both being used in their own way, allowing people to use pde files for arduino is sacrilegious to both camps.

In regards to other arduino-based examples and etc using PDE. (Looking at #752 specifically ) The correct place to submit an issue is on THAT codebase to rename .pde; not for tools like this one to support pde.

It also makes life difficult for people who use both Arduino and Processing in their educational work, such as myself. Any work I do in the Processing language is renamed to the Arduino extension automatically, and it doesn't need to be, because PDE is not arduino; INO is.

I hope this closes the issue enough to not bring this up again; It's like typesafety for files; you can't rename an short an int and call it a day because now code compiles.

[msftclas]

All CLA requirements met.

[Sneezry]

I agree with you that the correct way should be to ask the original project to change .pde to .ino, but not make a tool to support .pde for Arduino.

However, as you said, we did have received some feedbacks to request .pde support. Usually, it is hard to meet all users' requirements, but we try our best to make it possible.

I do not think it is a good idea to tell users what is the correct way. It makes me remind the standard of utf-8, with BOM or without BOM.

A better way to handle this issue I think is to add a new configuration to enable/disable .pde support, and disable this feature by default. Then everyone should be happy.

[Sneezry]

Cool! Thanks!