Make template usable for writing python libraries

[MisterEggnog]

Formerly this template only produced programs, now it will remove main.py if not specified as a binary.
I use the term binary just to refer to executable, a better name may be preferable.

[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.56%.

Quality metrics	Before	After	Change
Complexity	0.65 ⭐	0.88 ⭐	0.23 👎
Method Length	19.20 ⭐	21.67 ⭐	2.47 👎
Working memory	3.65 ⭐	4.04 ⭐	0.39 👎
Quality	92.36% ⭐	91.80% ⭐	-0.56% 👎

Other metrics	Before	After	Change
Lines	20	28	8

Changed files	Quality Before	Quality After	Quality Change
hooks/post_gen_project.py	92.36% ⭐	91.80% ⭐	-0.56% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

Legend and Explanation

The emojis denote the absolute quality of the code:

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• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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We are actively working on this report - lots more documentation and extra metrics to come!

Help us improve this quality report!

[MisterEggnog]

Forgot to remove print statement & added global var to make things simpler.