projectGenerator local_addon fixes

[dimitre]

This is a fix of local_addons functionality
translates some ofDirectory operations and listings to fs::path, so it removes the complexity of using ofToDataPath
because projectGenerator/bin/data is not used.

with this PR we can remove "local_addons" folder from the project itself, it will be created from PG

[ofTheo]

one thing to look at is the non Xcode projects/files that reference ofxProjectGenerator:
https://github.com/openframeworks/projectGenerator/search?q=ofxProjectGenerator

Ideally this PR would also update those files so they continue to be able to compile the PG.

[dimitre]

Nice I'll be updating this PR.
btw I think this does the trick to the optional folder

		mv apps/projectGenerator/commandLine .
		if [ -d "apps/projectGenerator/ofxProjectGenerator" ]; then
			mv apps/projectGenerator/ofxProjectGenerator .
		fi
		rm -rf apps/projectGenerator
		mkdir apps/projectGenerator
		mv commandLine apps/projectGenerator/
		if [ -d "ofxProjectGenerator" ]; then
			mv ofxProjectGenerator apps/projectGenerator/
		fi
		cd apps/projectGenerator/commandLine
		deleteCodeblocks
		deleteVS
		deleteXcode

[ofTheo]

ahh thanks - already did it via:
openframeworks/openFrameworks@a76ef83

slightly different approach - but should work

[dimitre]

I'm also removing Poco manually from everything. :) 🧹

[dimitre]

Finally, cleanup done and passing tests.
I just don't have how to test if the project files edits are ok